#  Sjaak, a program for playing chess variants
#  Copyright (C) 2011, 2014  Evert Glebbeek
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This is a variant description file for Sjaak.
# It can be used to configure Sjaak to play a chess variant by specifying the movement mode of the pieces.
# Empty lines and anything following a # character are ignored.

# To define a variant, begin a line with "Variant: <name>", then follow on subsequent lines with descriptions
# of the board, the pieces used and their movement, and other rules used in the variant.
# There are a number of examples below, but first we'll go into some background.

# THE BOARD AND ZONES
#
# The board size is specified by (files)x(ranks), for instance
#  Board: 8x8
# defines a standard chess board. There are some limits on the size of a board: the number of files
# and ranks needs to be smaller than 16 and the total size of the board needs to be less than 128
# squares.
# For some of the rules, it's necessary to identify a part of the board. This is done by defining a "zone",
# which lists the squares on the board that are part of that zone.
# For instance:
#  Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
#  Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
# defines the 8th rank (rank8) of the board.
# Files are identified by letters, "a" being the first. Ranks are labelled by numbers, starting at "1".
# The square "a1" is in the lower-left hand side of the board.
# Two special zones, "empty" and "all", are pre-defined. As the names indicate, "empty" corresponds to an
# empty board while "all" corresponds to the entire board.
#
# It's possible to exclude certain regions of the board. Moves are never generated from or to these squares:
#  Exclude: g1,h1,g2,h2,g3,h3,g4,h4,g5,h5,g6,h6,a7,b7,c7,d7,e7,f7,g7,h7,a8,b8,c8,d8,e8,f8,g8,h8
# excludes the last two rows and the rightmost files on the board, effectively reducing the board to 6x6.
#
# For some games, the victory (or drawing!) condition can be to occupy a specific region of the board.
# This is referred to here as "capture the flag". To enable this, a special zone has to be defined for each
# player, WhiteFlag for white and BlackFlag for black:
#  WhiteFlag: e1
#  BlackFlag: e8
# The game ends when white captures and holds all black flags and vice versa.

# PIECES
#
# Piece descriptions start with a "Piece:" line. On following lines the piece move and special properties can
# be defined.

# MOVEMENT TYPES
#
# In order to define new variants, it is important to know how to specify the movement of the pieces.
# Sjaak distinguishes three types of moves:
#
# Sliders  - move along a ray direction until they encounter another piece or the edge of the board
# Leapers  - perform single steps to specified target squares
# Steppers - perform single (repeated) steps in a particular board direction
#
# Each of these moves treats the board in a slightly different way, and so the description of moves for each
# is different:
#
# Sliders move along a ray, either horizontal (H), vertical (V), diagonal (D) or anti-diaginal (A).
# Examples:
#  slide (H,V)         - describes a chess rook
#  slide (A,D)         - describes a bishop
#  slide (H,V,A,D)     - describes a queen
#
# Leaper moves can become complicated, but in their simplest form they just specify the step-vector, which is
# then mirrored to give a total of up to 8 target squares.
# Examples:
#  leap (2,1)          - describes a knight
#  leap (1,2)          - alternative description of a knight
#  leap (1,1)          - describes a ferz
#  leap (2,2)          - an elephant
#  leap (1,0)          - a wazir
#  leap (2,0)          - a dabbabah
# The complications begin when a piece is a compound leaper, meaning it can choose between different leaper
# moves. For instance, a king can move as a ferz, or as a wazir:
#  leap (1,0)|(1,1)    - a king
# However, a leaper can also be a two-step leaper, which first moves as one type of leaper and then again as
# another type of leaper:
#  leap (1,0)+(1,1)    - move as a wazir first and then as a ferz
# Typically, this is useful to define lame leapers by also specifying a mask:
#  leap ((1,0)+(1,1)) & (1,2)
# describes a piece that moves first as a wazir (only to empty squares) and then again as a ferz. However,
# the final destination must be a square that could have been reached by a knight. In other words, this
# describes a piece that moves like a knight, but can be blocked. A Xiangqi horse.
#
# For steppers, board directions are indicated by compass points, so "north" (the side of the board where
# black starts out), "south" (where white starts), "east" (the king-side, the direction of the H-file) and
# "west" (towards the A-file).
# Steppers are intended to be asymmetric (the move description is for white and mirrored for black),
#  step N              - describes a piece that moves one square "north", a white pawn
#  step S              - describes a piece that moves one square "south", a black pawn
# Optionally, the direction can be prefixed with a number (1-7):
#  step 2N             - the initial double step of a white pawn.
# Steppers are normally used to define pawns, and a number of pawn-specific evaluation terms are only
# activated for pieces that are defined as stepper moves. Steppers also have their moves generated in bulk,
# one direction at a time (as opposed to one piece at a time), which impacts performance.
#
# Finally, there are two variations to the three above movement types: hoppers and asymmetric leapers.
#
# Hoppers are sliders that need to jump over another piece before they can move.
#  hop (H,V)           - describes the capture move of a cannon in Xiangqi
# Currently, capture is replacement only. It is not possible (yet) to define a piece that captures by leaping
# over its victim.
#
# Asymmetric leapers are leapers that, as the name implies, move differently for white and black.
# Their syntax is similar to that of normal leapers, but instead of specifying the movement vector, it's
# necessary to specify each step:
#  aleap (0,1)         - a piece that moves one square north for white and one square south for black (like a pawn)
#  aleap (1,1)|(1,-1)|(-1,-1)|(-1,1)|(0,1) - a Makruk elephant or silver general
#  aleap (1,1)|(-1,1)|(1,0)|(-1,0)|(0,1)|(0,-1) - a gold general

# MOVES AND CAPTURES
#
# A piece can have more than one movement type defined for it, simply by specifying them one after the other
# on separate lines:
#
#  Move: slide (H,V,A,D)
#  Move: leap (1,2)
#
# defines the move for an Amazon. The move types must be different on each line, or the result will be
# undefined.
# If a capture move is not specified, it is assumed to be the same as the normal move. To disable captures for
# a particular piece type, specify "none":
#
#  Capture: none     # Piece cannot capture

# SPECIAL MOVES (DOUBLE PUSHES)
#
# For pieces that can perform special moves, it's necessary to specify both the move and the location on the
# board where they can make the special move. This is done by defining a zone and then referencing it from the
# piece description:
#  Special: rank2, rank7, step 2N
# defines the initial double step for a white pawn (on rank 2) and a black pawn (on rank 7).
# Special moves currently cannot be captures, and do not depend on whether the piece has moved or not.

# INITIAL MOVES (DOUBLE PUSHES, ALTERNATIVE)
#
# Initial moves are moves that can only be made by a piece that has not moved yet.
#  Initial: step 2N
# defines the initial double step for a white pawn (on rank 2) and a black pawn (on rank 7).
# Initial moves currently cannot be captures, and must be "step" moves.

# SPECIAL MOVES (CASTLING)
#
# Castling is a special move where two friendly pieces move. It is only possible if neither of the two pieces
# has moved already. All squares between the initial and final positions of the two pieces must be empty
# (apart from the two pieces themselves).
# If the primary castling piece is royal, then all squares between the king's initial and final position must
# be "safe".
# To define a castling move, specify the (default) starting position of the king, the king's destination
# square and the secondary's (default) starting position. The secondary's destination square is derived from
# the king's move: if the king moves to the king-side (east side) of the board, the secondary moves to the
# left of the king. If the king moves to the queen-side (west side) of the board the secondary moves to the
# right of the king.
# It is possible to specify multiple destination squares for the king in a comma-separated list. This defines
# a flexible form of castling where the king is allowed to move to any of the given destination squares.
# Example:
#
#  Castle: white e1-g1 with h1     # Canonical king-side castling
#  Castle: white e1-c1 with a1     # Canonical queen-side castling
#  Castle: white e1-c1,b1 with a1  # Queen-side castling, either 2-step or 3-step
#
# To define FRC-style castling, simply define the "standard" castling rule (which provide the destination
# square for the king and the default location of the rook). The FRC rule will be based on this
# and the actual specified position of the king and rook in the startup FEN.
# Behaviour is undefined if all squares are not on one rank.

# RESTRICTING MOVEMENT
#
# It is possible to restrict the movement options of a piece by specifying the locations it is allowed to move
# to:
#  Zone: white_palace = d1,e1,f1, d2,e2,f2, d3,e3,f3
#  Zone: black_palace = d8,e8,f8, d9,e9,f9, d10,e10,f10
#
#  Piece: King
#  Move: leap (0,1)
#  Symbol: "K", "K,k"
#  Flags: royal
#  Prison: white_palace, black_palace
# Defines the XiangQi king, which is only allowed to move inside the palace.
#
# Alternatively, it is possible to mark squares as unpassable by particular pieces:
#  Zone: white_centre = e4,d4
#  Zone: black_centre = e5,d5
#
#  Piece: Rook
#  Move: slide (H, V)
#  Symbol: "R", "R,r"
#  Block: white_centre, black_centre
# defines a rook that cannot move to the centre (e4/d4 for white, e5/d5 for black).

# DROPS
#
# For variants that include drops, the default rule is that pieces in-hand may be dropped anywhere on the
# board, as long as pieces are allowed to move from their new location. You can override this:
#  Drop zone: all, all
# allows pieces to be dropped everywhere, while
#  Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1
#  Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
#
#  Drop zone: rank1, rank8
# restricts drops to the (own) back rank.
# Specifying the drop zone in this way implicitly sets the "drop_dead" piece property (see below).

# PROMOTIONS
#
# Pieces promote as soon as they reach their promotion zone, to one of the possible promotion choices:
#  Promotion: rank8, rank1, "QRBN"
# defines the promotion for a white pawn on rank 8 and for a black pawn on rank 1.
# A promotion choice of "+" is treated in a special way: if the piece
# symbol is "P" and it has promotion choice "+", then the piece will be
# promoted to a piece with symbol "+P". It is your responsibility to make
# sure that this piece is defined in the game!
# If capture/drop rules are used, pieces that have a symbol that starts
# with "+" will be demoted when captured.
# Example:
#  Piece: Queen
#  Move: slide (D,A,H,V)
#  Symbol: "+P", "+P,+p"
#
#  Piece: Pawn
#  Move: step N
#  Capture: step NE,NW
#  Special: rank2, rank7, step 2N
#  Symbol: " ", "P,p"
#  Flags: set_ep,take_ep
#  Promotion: rank8, rank1, "+"
#
# This example defines a Queen that will demote to Pawn when captured, and
# a Pawn whose only promotion choice is the Queen (+P).
# By default, promotion is mandatory if the piece has no legal moves from a given square, otherwise it is
# optional. You can override this rule by specifying the optional promotion zone explicitly:
#  Optional promotion: empty, empty
# makes all promotions for this piece type mandatory.

# PIECE PROPERTIES
#
# Pieces can have a number of special properties, listed on a "Flags:" line. Multiple properties can be
# specified in one line, separated by a comma. The following properties can be specified:
#
#  royal          This is a royal piece: the game is lost if a side were to lose all royal pieces.
#  set_ep         This piece sets the "en-passant" capture square when it makes a special move.
#  take_ep        This piece type can capture on the "en-passant" square.
#  drop_no_check  This piece may not be dropped to give check.
#  drop_no_mate   This piece may not be dropped to give mate (it may give check).
#  drop_one_file  This piece may not be dropped on a file that already contains a friendly piece of the same type.
#  drop_dead      This piece may be dropped even where it cannot move.
#  no_mate        This piece may not deliver mate. It may deliver check.
#  shak           This piece delivers a special "shak" check.
#  assimilate     Pieces that capture this piece promote to this piece.
#  no_retaliate   After capturing a piece with this flag, your own pieces with the flag may not becaptured the next turn.
#  endangered     This piece may not capture another endangered piece if that piece is protected.
#  iron           This piece may not be captured at all.
#  capture_flag   This piece may "capture the flag". By default, all pieces may do this.

# LIMIT THE NUMBER OF PIECES
#
# It is possible to limit the number of pieces of a particular type (by promotion) by specifying that number
# in a "Max: number" or "Max: white,black" line:
#  Max: 2
# allows only two of this piece type for white and for black. You can set a different number for white and for
# black. Pass 0 to leave this at the default (whch is 1 for royal pieces and unlimited for all other piece
# types).

# EXTRA RULES AND VICTORY CONDITIONS
#
# It's possible to specify a number of extra rule options or game-ending conditions.
# End-of-game scores can be any of "win", "loss", "draw" or "illegal".
# The following game-ending conditions can be defined:
#
#  checkmate         The enemy royal piece is under attack and cannot avoid being captured (win, loss or draw, normally win)
#  stalemate         The enemy cannot make any legal moves (win, loss or draw, normally draw)
#  repeatN           The game is declared a draw if a position occurs for the Nth time (win, loss or draw, normally draw and N = 3)
#                    Set N=0 to disable any special treatment for repetitions.
#  perpetual         As repeatN, but refers to in-check positions. If not specified defaults to "repeat" (win, loss, draw or repeat).
#  loneking          Triggered if a side has a lone king remaining and baring rules are in effect (win, loss or draw, normally loss)
#  nopieces          Triggered if the side-to-move has no pieces left (win, loss or draw, normally loss).
#  captureanyflag    Triggered when capturing any flag (win, loss or draw, normally win).
#  captureallflags   Triggered when capturing all flags (win, loss or draw, normally win).
#  movecountdraw     After the specified number of reversible moves, the game is declared a draw. Set to 0 to disable.
#
# Examples (these are the defaults):
#  Rule: checkmate = win
#  Rule: stalemate = draw
#  Rule: repeat3 = draw
#  Rule: movecountdraw = 50
#
# The following special rules can be defined:
#
#  taboo             The kings may not share a ray with no pieces between them
#  keep capture      Captured pieces are held in your hand (rather than just disappearing)
#  return capture    Captured pieces are returned to their owner's hand
#  forced capture    You must make a capture if you can
#  duplecheck        If a side has more than one king, he is assumed to be in check if all of them are attacked.
#  check any king    If there are multiple kings, attacking any one of them counts as check.
#                    Without either of the last two rules a side with more than one king can never be in check.
#  allow pickup      As a move you can take one of your non-royal pieces from the board into your hand.
#  allow drops       As a move you may place a piece from your hand on the board.
#  force drops       If you have a piece in-hand you must place one on the board.
#  gate drops        You may "gate" pieces from your hand when first moving a back-rank piece.
#  promote here      A piece that is in the promomotion zone may promote without making a move.
#  promote drop      A piece that is dropped in the promomotion zone may promote immediately.
#  special init      Special moves are only allowed if the piece has not moved before.
#  bare rule         If you have a bare king, you have one turn to bare your opponent's king in turn.
#  chase rule        Xiangqi-style chases are not allowed.
#  shak rule         Checkmate can only be given if a chain of checks leading to it contains at least one "shak" check.
#  en-passant check  Sliding royals can be checked "en-passant", that is, they cannot slide through check.
#  quiet promotion   Promotion moves must be "quiet" moves.
#  promote by move   A piece in the promotion zone can promote and move immediately as the new piece.


# PIECE NAMES AND SYMBOLS
#
# Pieces can be assigned names and symbols.
# The piece name property is given on the "Piece:" line. It is an arbitrary
# string with no special meaning; SjaakII uses this when asked to list the
# rules and dump the internal board representation, but it is otherwise
# purely cosmetic.
# The piece symbol is set using the "Symbol:" property:
#  Symbol: "N", "N,n"
# The first string ("N") is used for the output of moves in standard
# algebraic notation (SAN), for instance "Nf3". The second string ("N,n")
# identifies the symbol by which the piece is identified in a FEN string,
# first for white and then for black. Normally, the black character is just
# the lower case version of the white character, which is in upper case,
# but Sjaak doesn't require this. The SAN character is normally the same as
# the white symbol, but again this is not required.
# There are two special symbols that have meaning when defining piece
# symbols:
# If a piece symbol starts with "+", say "+P", then this piece will demote to
# "P" when captured, and a piece "P" will promote to this piece (if it has
# promotion choice "+").
# If a piece symbol ends with "~", say "Q~", then this piece will demote to
# whichever piece type promotes to "Q~". Make sure that there is a piece
# type that lists "Q~" as a promotion option!

# PIECE VISUALISATION (XBOARD/WINBOARD)
#
# You can specify the piece graphic that is used by XBoard/WinBoard to represent the pieces in your variant.
# XBoard (4.8) uses a string of 44 (2x22) or more (4.9+) characters in length. To use the N-th image you
# simply have to replace the N-th character in the string with the symbol you assigned to the piece. The first
# set of characters are for white, the last set are for black. The last character listed is always the King.
# The default value of the string is "PNBRQFEACWMOHIJGDVLSUKpnbrqfeacwmohijgdvlsuk", where the characters
# represent the following pieces:
#   1 P=Pawn
#   2 N=Knight
#   3 B=Bishop
#   4 R=Rook
#   5 Q=Queen
#   6 F=Ferz
#   7 E=Alfil
#   8 A=Archbishop
#   9 C=Chancellor
#  10 W=Wazir
#  11 M=Man
#  12 O=Cannon
#  13 H=Nightrider
#  14 I=Dragon Horse
#  15 J=Dragon King
#  16 G=Grasshopper
#  17 D=Alternative Chancellor image
#  18 V=Falcon
#  19 L=Lance (or Amazon/Berolina pawn)
#  20 S=Snake
#  21 U=Unicorn
# For XBoard 4.9 and later:
#  22 L!=Lion
#  23 W!=Wolf 
#  24 C'=Camel 
#  25 Z'=Zebra 
#  26 Z=Wizard 
#  27 L'=Amazon (Lance duplicat without Pawn character) 
#  28 minor Lion (Lion duplicat without trading restriction) 
#
# After this follows the "promoted sequence", which is paired against the normal series:
#  p1 +P=Tokin (turban without ornament) 
#  p2 +N=Claw 
#  p3 +B=flat mitre without cross 
#  p4 +R=roofed Rook without battlements 
#  p5 +Q=turban with circle ornament (+L in Shogi) 
#  p6 +F=Sword without stripe 
#  p7 +E=alternate King (not visually different and still royal) 
#  p8 +A=alternate Queen (not visually different) 
#  p9 +C=alternate Lion (not visually different, still untradable) 
# p10 +W=Rook without battlements 
# p11 +M=lying sword without stripe 
# p12 +O=Dolphin 
# p13 +H=Sword 
# p14 +I=Leopard 
# p15 +J=lying sword 
# p16 +G=turban with star ornament 
# p17 +D=narrow Queen crown 
# p18 +V=lying narrow Queen crown 
# p19 +L=Knight (not visually different) 
# p20 +S=Elephant (not visually different) 
# p21 +U=Bishop without cross 
# p22 +L!=Gnu 
# p23 +W!=Viking helmet 
# p24 +C'=Iron General (simple helmet) 
# p25 +Z'=Champion (hoplit helmet) 
# p26 +Z=Tower 
# p27 +L'=Flying Dragon 
# And finally at the end,
# xxx K=King 
#
# If you do not use a particular bitmap, simply put "." in its place. Example:
#  XBoard pieces: "PNBRQFEACWMOHIJGDVLSUKpnbrqfeacwmohijgdvlsuk"
# When specifying the string, you can write both "XBoard" and "WinBoard".



#############################################################
# Example: duplicate the definition for standard FIDE chess #
#############################################################
Variant: FIDE Chess (8x8)                                      # Name with which the variant can be selected
Board: 8x8                                                     # Board size
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"    # Startup FEN, pieces defined below
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8                          # Special regions on the board, used below
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Initial: step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw


############################################################################################
# Example: wolves and Sheep. The wolves try to corner the sheep, the sheep tries to escape #
############################################################################################
Variant: Wolves and Sheep (8x8)
Board: 8x8
FEN: "1w1w1w1w/8/8/8/8/8/8/4S3 w - -"
XBoard pieces: ".....W...S.................w...s............"
BlackFlag: a8,b8,c8,d8,e8,f8,g8,h8

Piece: Sheep
Move: leap (1,1)
Capture: none
Symbol: "S", "S,s"

Piece: Wolf
Move: aleap (1,1)|(-1,1)
Capture: none
Symbol: "W", "W,w"

Rule: captureanyflag = win
Rule: stalemate = win



###########################
# Maharaja and the Sepoys #
###########################
Variant: Maharaja
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/8/4M3/ w KQkq -"
XBoard pieces: ".........M............pnbrq................k"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 32

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 32

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 50

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 95

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Maharaja
Move: slide (D,A,H,V)
Move: leap (2,1)
Symbol: "M", "M,m"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 10





######################################################
# Peasant Revolt (Pritchard 2007, chessvariants.org) #
######################################################
Variant: Peasant's Revolt (8x8)
Board: 8x8
FEN: "1nn1k1n1/4p3/8/8/8/8/PPPPPPPP/4K3 w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 250

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Promotion: rank8, rank1, "QRBN"
Value: 100




###################################
# Corridor Chess (Pritchard 2007) #
###################################
Variant: Corridor Chess (8x8)
Board: 8x8
FEN: "1nrqkrn1/2b2b2/1pppppp1/8/8/1PPPPPP1/2B2B2/1NRQKRN1 w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Promotion: rank8, rank1, "QRBN"
Value: 100




############################################################
# Legan's chess (http://en.wikipedia.org/wiki/Legan_chess) #
############################################################
Variant: Legan's Chess (8x8)
Board: 8x8
FEN: "knbrp3/bqpp4/npp5/rp1p3P/p3P1PR/5PPN/4PPQB/3PRBNK w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promo = a5,a6,a7,a8,b8,c8,d8
Zone: black_promo = e1,f1,g1,h1,h2,h3,h4

# Define the pieces
Piece: Knight                                                  # New piece and its name
Move: leap (2,1)                                               # Movement type
Symbol: "N", "N,n"                                             # Symbol used for SAN and symbols used in FEN
Value: 320                                                     # Piece value, used by evaluation

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step NW
Capture: step N,W
Symbol: " ", "P,p"
Promotion: white_promo, black_promo, "QRBN"
Value: 100




##################################
# Diamond Chess (Pritchard 2007) #
##################################
Variant: Diamond Chess (8x8)
Board: 8x8
FEN: "krbp4/rqnp4/nbpp4/pppp4/4PPPP/4PPBN/4PNQR/4PBRK w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promo = a1,a2,a3,a4,a5,a6,a7,a8,b8,c8,d8,e8,f8,g8,h8
Zone: black_promo = a1,b1,c1,d1,e1,f1,g1,h1,h2,h3,h4,h5,h6,h7,h8

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step NW
Capture: step N,W
Symbol: " ", "P,p"
Promotion: white_promo, black_promo, "QRBN"
Value: 100




###################################
# Diagonal Chess (Pritchard 2007) #
###################################
Variant: Diagonal Chess (8x8)
Board: 8x8
FEN: "4pnrk/4pbpr/4pbqn/4pppp/PPPP4/NQBP4/RPBP4/KRNP4 w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promo = h1,h2,h3,h4,h5,h6,h7,a8,b8,c8,d8,e8,f8,g8,h8
Zone: black_promo = a1,b1,c1,d1,e1,f1,g1,h1,a2,a3,a4,a5,a6,a7,a8

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step NE
Capture: step N,E
Symbol: " ", "P,p"
Promotion: white_promo, black_promo, "QRBN"
Value: 100




#################################
# Corner Chess (Pritchard 2007) #
#################################
Variant: Corner Chess (8x8)
Board: 8x8
FEN: "kbp2pbq/nrp2prn/pp4pp/8/8/PP4PP/NRP2PRN/QBP2PBK w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promo = a8,b8,c8,d8,e8,f8,g8,h8
Zone: black_promo = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step NE,NW
Capture: step N
Symbol: " ", "P,p"
Promotion: white_promo, black_promo, "QRBN"
Value: 100



############################################################################
# A variant of Shatranj with dabbabah's, supposedly from 9th century India #
############################################################################
Variant: Ninth Century Indian Chess (8x8)
Board: 8x8
FEN: "dnrkfrnd/pppppppp/8/8/8/8/PPPPPPPP/DNRKFRND w - -"
XBoard pieces: "PN.R.F........D......Kpn.r.f........d......k"     # Use the "crowned rook" for the dabbabah
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Dabbabah
Move: leap (2,0)
Symbol: "D", "D,d"
Value: 200

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Ferz
Move: leap (1,1)
Symbol: "F", "F,f"
Value: 150

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Promotion: rank8, rank1, "F"
Value: 100

Rule: stalemate = win      # The stale-mated player wins (!)
Rule: loneking = loss




###########################################################################
# Troitzky chess                                                          #
# http://www.chessvariants.org/index/msdisplay.php?itemid=MPtroitzkychess #
###########################################################################
Variant: Troitzky Chess (10x10)
Board: 10x10
FEN: "****qk****/**rnbbnr**/*pppppppp*/*8*/10/10/*8*/*PPPPPPPP*/**RNBBNR**/****QK**** w - -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promotion = a6,b8,c9,d9,e10,f10,g9,h9,i8,j6
Zone: black_promotion = a5,b3,c2,d2,e1,f1,g2,h2,i3,j5
Zone: rank8 = b8,c8,d8,e8,f8,g8,h8,i8
Zone: rank3 = b3,c3,d3,e3,f3,g3,h3,i3
Exclude: a1,b1,c1,d1,g1,h1,i1,j1,a2,b2,i2,j2,a3,j3,a4,j4
Exclude: a10,b10,c10,d10,g10,h10,i10,j10,a9,b9,i9,j9,a8,j8,a7,j7

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f2-e1 with e1
Castle: white f2-f1 with f1
Castle: black f9-e10 with e10
Castle: black f9-f10 with f10

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank3, rank8, step 2N
Symbol: " ", "P,p"
Promotion: white_promotion, black_promotion, "QRBN"
Value: 100



###########################################################################
# Troitzky chess, Byway setup                                             #
# http://www.chessvariants.org/index/msdisplay.php?itemid=MPtroitzkychess #
###########################################################################
Variant: Troitzky Chess Byway (10x10)
Board: 10x10
FEN: "****rr****/**nbqkbn**/*pppppppp*/*8*/10/10/*8*/*PPPPPPPP*/**NBQKBN**/****RR**** w KQkq -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: white_promotion = a6,b8,c9,d9,e10,f10,g9,h9,i8,j6
Zone: black_promotion = a5,b3,c2,d2,e1,f1,g2,h2,i3,j5
Zone: rank8 = b8,c8,d8,e8,f8,g8,h8,i8
Zone: rank3 = b3,c3,d3,e3,f3,g3,h3,i3
Exclude: a1,b1,c1,d1,g1,h1,i1,j1,a2,b2,i2,j2,a3,j3,a4,j4
Exclude: a10,b10,c10,d10,g10,h10,i10,j10,a9,b9,i9,j9,a8,j8,a7,j7

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f2-e1 with e1
Castle: white f2-f1 with f1
Castle: black f9-e10 with e10
Castle: black f9-f10 with f10

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank3, rank8, step 2N
Symbol: " ", "P,p"
Promotion: white_promotion, black_promotion, "QRBN"
Value: 100



##########################################
# Twilight Chess, with drops and pickups #
##########################################
Variant: Twilight Chess (8x8)
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Rule: allow pickup, allow drops



##################
# Judkins' Shogi #
##################
Variant: Judkins' Shogi (6x6)
Board: 6x6
FEN: "rbnsgk/5p/6/6/P5/KGSNBR"
XBoard pieces: "PNBR.S...G.++++.+Kpnbr.s...g.++++.+k"
XBoard parent: "shogi"
Zone: white_promotion = a5,b5,c5,d5,e5,f5,a6,b6,c6,d6,e6,f6
Zone: black_promotion = a2,b2,c2,d2,e2,f2,a1,b1,c1,d1,e1,f1

# Define the pieces
Piece: Knight
Move: aleap (1,2)|(-1,2)
Symbol: "N", "N,n"
Promotion: white_promotion, black_promotion, "+"
Value: 250

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Promotion: white_promotion, black_promotion, "+"
Value: 575

Piece: Silver general
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Symbol: "S", "S,s"
Promotion: white_promotion, black_promotion, "+"
Value: 375

Piece: Gold general
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "G", "G,g"
Value: 450

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Promotion: white_promotion, black_promotion, "+"
Value: 650

Piece: Pawn
Move: step N
Symbol: "P", "P,p"
Promotion: white_promotion, black_promotion, "+"
Flags: drop_no_mate, drop_one_file
Value: 80

Piece: Promoted Knight
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+N", "+N,+n"
Value: 500

Piece: Dragon Horse
Move: slide (D,A)
Move: leap (1, 0)
Symbol: "+B", "+B,+b"
Value: 825

Piece: Promoted Silver
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+S", "+S,+s"
Value: 490

Piece: Dragon King
Move: slide (H,V)
Move: leap (1, 1)
Symbol: "+R", "+R,+r"
Value: 950

Piece: Promoted Pawn
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+P", "+P,+p"
Value: 530


Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Rule: keep capture, allow drops
Rule: repeat4 = draw
Rule: perpetual = illegal



###################################################################
# Omicron chess: omega chess on a smaller board (2 ranks deleted) #
###################################################################
Variant: Omicron Chess (12x10)
Board: 12x10
FEN: "w**********w/*crnbqkbnrc*/*pppppppppp*/*10*/*10*/*10*/*10*/*PPPPPPPPPP*/*CRNBQKBNRC*/W**********W w KQkq -"
XBoard pieces: "PNBRQ..C.W...........Kpnbrq..c.w...........k"

Exclude: b1,c1,d1,e1,f1,g1,h1,i1,j1,k1
Exclude: b10,c10,d10,e10,f10,g10,h10,i10,j10,k10
Exclude: a2,a3,a4,a5,a6,a7,a8,a9
Exclude: l2,l3,l4,l5,l6,l7,l8,l9
Zone: white_promotion = b9,c9,d9,e9,f9,g9,h9,i9,j9,k9;
Zone: black_promotion = b2,c2,d2,e2,f2,g2,h2,i2,j2,k2;
Zone: rank3 = b3,c3,d3,e3,f3,g3,h3,i3,j3,k3;
Zone: rank8 = b8,c8,d8,e8,f8,g8,h8,i8,j8,k8;

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 250

Piece: Champion
Move: leap (0,1)|(0,2)|(2,2)
Symbol: "C", "C,c"
Value: 375

Piece: Wizard
Move: leap (1,1)|(1,3)
Symbol: "W", "W,w"
Value: 350

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 400

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 600

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white g2-i2 with j2
Castle: white g2-e2 with c2
Castle: black g9-i9 with h9
Castle: black g9-e9 with j9

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank3, rank8, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: white_promotion, black_promotion, "QRBNWC"
Value: 100



#############
# EuroShogi #
#############
Variant: EuroShogi (8x8)
Board: 8x8
FEN: "1nbgkgn1/1r4b1/pppppppp/8/8/PPPPPPPP/1B4R1/1NGKGBN1[-] w 0 1"
XBoard pieces: "PNBR.....G.++++Kpnbr.....g.++++k"
XBoard parent: "shogi"
Zone: white_promotion = a8,b8,c8,d8,e8,f8,g8,h8,a7,b7,c7,d7,e7,f7,g7,h7,a6,b6,c6,d6,e6,f6,g6,h6
Zone: black_promotion = a3,b3,c3,d3,e3,f3,g3,h3,a2,b2,c2,d2,e2,f2,g2,h2,a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: aleap (1,2)|(-1,2)|(1,0)|(-1,0)
Symbol: "N", "N,n"
Promotion: white_promotion, black_promotion, "+"
Optional promotion: empty, empty
Value: 250

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Promotion: white_promotion, black_promotion, "+"
Optional promotion: empty, empty
Value: 575

Piece: Gold general
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "G", "G,g"
Value: 450

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Promotion: white_promotion, black_promotion, "+"
Optional promotion: empty, empty
Value: 650

Piece: Pawn
Move: step N
Symbol: "P", "P,p"
Promotion: white_promotion, black_promotion, "+"
Optional promotion: empty, empty
Flags: drop_no_mate, drop_one_file
Value: 80

Piece: Promoted Knight
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+N", "+N,+n"
Value: 500

Piece: Dragon Horse
Move: slide (D,A)
Move: leap (1, 0)
Symbol: "+B", "+B,+b"
Value: 825

Piece: Dragon King
Move: slide (H,V)
Move: leap (1, 1)
Symbol: "+R", "+R,+r"
Value: 950

Piece: Promoted Pawn
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+P", "+P,+p"
Value: 530


Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Rule: keep capture, allow drops
Rule: repeat4 = draw



#############
# YariShogi #
#############
Variant: YariShogi (7x9)
Board: 7x9
FEN: "rnnkbbr/7/ppppppp/7/7/7/PPPPPPP/7/RBBKNNR[-] w 0 1"
XBoard pieces: "PNBR.......++++Kpnbr.......++++k"
XBoard parent: "shogi"
Zone: white_promotion = a9,b9,c9,d9,e9,f9,g9,a8,b8,c8,d8,e8,f8,g8,a7,b7,c7,d7,e7,f7,g7
Zone: black_promotion = a3,b3,c3,d3,e3,f3,g3,a2,b2,c2,d2,e2,f2,g2,a1,b1,c1,d1,e1,f1,g1

# Define the pieces
Piece: YariKnight
Move: aleap (1,2)|(-1,2)
Move: step 9N
Symbol: "N", "N,n"
Promotion: white_promotion, black_promotion, "+"
Value: 300

Piece: YariBishop
Move: aleap (1,1)|(-1,1)
Move: step 9N
Symbol: "B", "B,b"
Promotion: white_promotion, black_promotion, "+"
Value: 400

Piece: YariRook
Move: slide (H)
Move: step 9N
Symbol: "R", "R,r"
Promotion: white_promotion, black_promotion, "+"
Value: 550

Piece: Pawn
Move: step N
Symbol: "P", "P,p"
Promotion: white_promotion, black_promotion, "+"
Flags: drop_no_mate, drop_one_file
Value: 80

Piece: YariSilver
Move: aleap (0,1)|(1,1)|(-1,1)
Move: step 9S
Symbol: "+P", "+P,+p"
Value: 375

Piece: YariGoldKnight
Move: aleap (0,1)|(1,1)|(-1,1)|(0,1)|(0,-1)
Move: step 9S
Symbol: "+N", "+N,+n"
Value: 425

Piece: YariGoldBishop
Move: aleap (0,1)|(1,1)|(-1,1)|(0,1)|(0,-1)
Move: step 9S
Symbol: "+B", "+B,+b"
Value: 425

Piece: Rook
Move: slide (H,V)
Symbol: "+R", "+R,+r"
Value: 650

Piece: General
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Rule: keep capture, allow drops
Rule: repeat4 = draw
Rule: perpetual = loss



#################
# Goro Goro Shogi #
#################
Variant: GoroGoro Shogi (5x6)
Board: 5x6
FEN: "sgkgs/5/1ppp1/1PPP1/5/SGKGS[-] w 0 1"
XBoard pieces: "P....S...G.+....+Kp....s...g.+....+k"
XBoard parent: "shogi"
Zone: white_promotion = a5,b5,c5,d5,e5,a6,b6,c6,d6,e6
Zone: black_promotion = a2,b2,c2,d2,e2,a1,b1,c1,d1,e1

# Define the pieces
Piece: Silver general
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Symbol: "S", "S,s"
Promotion: white_promotion, black_promotion, "+"
Value: 375

Piece: Gold general
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "G", "G,g"
Value: 450

Piece: Pawn
Move: step N
Symbol: "P", "P,p"
Promotion: white_promotion, black_promotion, "+"
Flags: drop_no_mate, drop_one_file
Value: 80

Piece: Promoted Silver
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+S", "+S,+s"
Value: 490

Piece: Promoted Pawn
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+P", "+P,+p"
Value: 530

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Rule: keep capture, allow drops
Rule: repeat4 = draw
Rule: perpetual = loss



#######################################
# Goro Goro Shogi Knight & Lance Drop #
#######################################
Variant: GoroGoroNL Shogi (5x6)
Board: 5x6
FEN: "sgkgs/5/1ppp1/1PPP1/5/SGKGS[NLnl] w 0 1"
XBoard pieces: "PN..LS...G.++..++Kpn..ls...g.++..++k"
XBoard parent: "shogi"
Zone: white_promotion = a5,b5,c5,d5,e5,a6,b6,c6,d6,e6
Zone: black_promotion = a2,b2,c2,d2,e2,a1,b1,c1,d1,e1

# Define the pieces

Piece: Silver general
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Symbol: "S", "S,s"
Promotion: white_promotion, black_promotion, "+"
Value: 375

Piece: Gold general
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "G", "G,g"
Value: 450

Piece: Pawn
Move: step N
Symbol: "P", "P,p"
Promotion: white_promotion, black_promotion, "+"
Flags: drop_no_mate, drop_one_file
Value: 80

Piece: Knight
Move: aleap (1,2)|(-1,2)
Symbol: "N", "N,n"
Promotion: white_promotion, black_promotion, "+"
Value: 250

Piece: Lance
Move: step 5N
Symbol: "L", "L,l"
Promotion: white_promotion, black_promotion, "+"
Value: 250

Piece: Promoted Silver
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+S", "+S,+s"
Value: 490

Piece: Promoted Pawn
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+P", "+P,+p"
Value: 530

Piece: Promoted Knight
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+N", "+N,+n"
Value: 500

Piece: Promoted Lance
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Symbol: "+L", "+L,+l"
Value: 480

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Rule: keep capture, allow drops
Rule: repeat4 = draw
Rule: perpetual = loss



###############################
# Ouk Chatrang, per Pritchard #
###############################
Variant: Cambodian (Ouk Chatrang)
Board: 8x8
FEN: "rnsmksnr/8/pppppppp/8/8/PPPPPPPP/8/RNSKMSNR w DEde - 0 1"
XBoard pieces: "PN.R.M....SKpn.r.m....sk"
XBoard parent: "makruk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank6 = a6,b6,c6,d6,e6,f6,g6,h6
Zone: rank3 = a3,b3,c3,d3,e3,f3,g3,h3
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 325

Piece: Silver general
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Symbol: "S", "S,s"
Value: 275

Piece: Met
Move: leap (1,1)
Special: rank1, rank8, aleap (-1,1)|(1,1) | (0,2)
Symbol: "M", "M,m"
Value: 150

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: King
Move: leap (0,1)|(1,1)
Special: rank1, rank8, aleap (-1,1)|(0,1)|(1,1)|(-1,0)|(1,0) | (-2,1)|(2,)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Promotion: rank6, rank3, "M"
Optional promotion: empty, empty
Value: 80

Rule: special init
Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



##########################################################
# Mini XiangQi, http://mlwi.magix.net/bg/minixiangqi.htm #
##########################################################
Variant: Mini Xiangqi
Board: 7x7
FEN: "rchkhcr/p1ppp1p/7/7/7/P1PPP1P/RCHKHCR w 0 1"
XBoard pieces: "PH.R.....K.C.ph.r.....k.c."
XBoard parent: "xiangqi"
Zone: palace = c1,d1,e1,c2,d2,e2,c3,d3,e3,c5,d5,e5,c6,d6,e6,c7,d7,e7

Piece: Knight
Move: leap (1,0)+(1,1)&(2,1)
Symbol: "H", "H,h"
Value: 400

Piece: Cannon
Move: slide (H,V)
Capture: hop (H,V)
Symbol: "C", "C,c"
Value: 450

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 950

Piece: King
Move: leap (0,1)
Prison: palace, palace
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: aleap (1,0)|(0,1)|(-1,0)
Symbol: "P", "P,p"
Value: 200

Rule: taboo, chase rule
Rule: checkmate = win
Rule: stalemate = win
Rule: repeat3 = draw



#####################################################################################
# Elven chess, http://www.chessvariants.org/index/msdisplay.php?itemid=MSelvenchess #
# This is an XBoard standard variant under the name "elven", so "XBoard pieces" and #
# "XBoard parent" are not needed.                                                   #
#####################################################################################
Variant: Elven (Chu) Chess
Board: 10x10

FEN: "r3k4r/mnb+rql+bbnm/pppppppppp/10/10/10/10/PPPPPPPPPP/MNB+BLQ+RBNM/R4K3R w KQkq - 0 1"
#XBoard pieces: "PNBRQ.....M.+++......LKpnbrq.....m.+++......lk"
#XBoard parent: elven
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8,i8,j8
Zone: rank3 = a3,b3,c3,d3,e3,f3,g3,h3,i3,j3

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 300

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 350

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-i1 with j1
Castle: white f1-c1 with a1
Castle: black f10-i10 with j10
Castle: black f10-c10 with a10

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank3, rank8, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank3, "QRBN"
Value: 100

Piece: Dwarf
Move: leap (0,1)|(1,1)
Symbol: "M", "M,m"
Value: 300

Piece: Elf
Move: slide (D,A)
Move: leap (0,1)
Symbol: "+B", "+B,+b"
Value: 525

Piece: Goblin
Move: slide (H,V)
Move: leap (1,1)
Symbol: "+R", "+R,+r"
Value: 725

Piece: Warlock
Move: leap ((0,1)|(1,1))+((0,1)|(1,1))
Flags: no_retaliate,endangered
Symbol: "L", "L,l"
Value: 1500

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



####################
# Example: 3-check #
####################
Variant: 3check (8x8)
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"
XBoard pieces: "PNBRQKpnbrqk"
XBoard parent: "3check"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw
Rule: check3 = win



####################
# Might Lion Chess #
####################
Variant: Lion (8x8, Mighty Lion)
Board: 8x8

FEN: "rlbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RLBQKBNR w KQkq - 0 1"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8                          # Special regions on the board, used below
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 300

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 350

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Piece: Lion
Move: leap ((0,1)|(1,1))+((0,1)|(1,1))
Flags: no_retaliate,endangered
Symbol: "L", "L,l"
Value: 1500

####################
# Chancellor Chess #
####################
Variant: Chancellor (8x8)
Board: 8x8
FEN: "rnbckbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBCKBNR w KQkq -"
XBoard pieces: "PNBR............CKpnbr............ck"
XBoard parent: "fairy"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Chancellor
Move: leap (2,1)
Move: slide (H,V)
Symbol: "C", "C,c"
Value: 875

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "CRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw


################
# Amazon Chess #
################
Variant: Amazon (8x8)
Board: 8x8
FEN: "rnbakbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBAKBNR w KQkq -"
XBoard pieces: "PNBR..............AKpnbr..............ak"
XBoard parent: "fairy"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Amazon
Move: leap (2,1)
Move: slide (D,A,H,V)
Symbol: "A", "A,a"
Value: 1200

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "ARBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw

################
# Musketeerish #
################
Variant: Musketeer
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR[EAMCHDULeamchdul] w KGFDCBQkgfdcbq -"
XBoard pieces: "PNBRQ.EAM..CLF.S.HD.UKpnbrqfeam..cl....hdsuk"
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR[CLcl] w KGFDCBQkgfdcbq -"
XBoard pieces: "PNBRQ......CL........Kpnbrq......cl........k"
XBoard parent: "seirawan"

Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: Dragon
Move: slide (D,A,H,V)
Move: leap (2,1)
Symbol: "D", "D,d"
Value: 1200

Piece: Chancellor
Move: slide (H,V)
Move: leap (2,1)
Symbol: "M", "M,m"
Value: 875

Piece: Archbishop
Move: slide (A,D)
Move: leap (2,1)
Symbol: "A", "A,a"
Value: 825

Piece: Elephant
Move: leap (2,0)|(2,2)|(1,1)|(1,0)
Symbol: "E", "E,e"
Value: 500

Piece: Hawk
Move: leap (2,0)|(2,2)|(3,3)|(3,0)
Symbol: "H", "H,h"
Value: 425

Piece: Leopard
Move: leap (2,1)
Move: step 2NE,2NW,2SE,2SW
Symbol: "L", "L,l"
Value: 500

Piece: Cannon
Move: aleap (2,0)|(-2,0)|(0,2)|(0,-2)|(1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(1,-1)|(-1,1)|(-1,-1)|(2,1)|(2,-1)|(-2,1)|(-2,-1)
Symbol: "C", "C,c"
Value: 500

Piece: Unicorn
Move: leap (2,1)|(3,1)
Symbol: "U", "U,u"
Value: 425

Piece: Fortress
Move: aleap (1,2)|(-1,2)|(1,-2)|(-1,-2)|(2,0)|(-2,0)|(0,2)|(0,-2)
Move: step 3NE,3NW,3SE,3SW
Symbol: "F", "F,f"
Value: 700

Piece: Spider
Move: leap (1,2)|(0,2)
Move: step 2NE,2NW,2SE,2SW
Symbol: "S", "S,s"
Value: 800

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "CLQRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw
Rule: gate drops



#################################################
# Archer/Spanish chess. Supposedly from 1739    #
# See http://www.quadibloc.com/chess/ch0502.htm #
#################################################
Variant: Spanish archer (10x8)
Board: 10x8
FEN: "rnbaqkabnr/pppppppppp/10/10/10/10/PPPPPPPPPP/RNBAQKABNR w KQkq -"
XBoard pieces: "PNBRQ.........AKpnbrq.........ak"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8,i8,j8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7,i7,j7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,j2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Archer
Move: step 9N,9SE,9SW
Symbol: "A", "A,a"
Value: 400

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-i1 with j1
Castle: white f1-c1 with a1
Castle: black f8-i8 with j8
Castle: black f8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QARBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



###################################################################################
# Enlarged and Improved Chess                                                     #
# http://www.quadibloc.com/chess/ch0502.htm                                       #
# http://www.chess10x10.com/10x10-chess-variants-Enlarged-and-Improved-Chess.html #
###################################################################################
Variant: Enlarged and improved chess
Board: 10x10
FEN: "rnbgqkgbnr/ppppeepppp/4pp4/10/10/10/10/4PP4/PPPPEEPPPP/RNBGQKGBNR w KQkq -"
XBoard pieces: "PNBRQ........EGKpnbrq........egk"
Zone: rank10 = a10,b10,c10,d10,e10,f10,g10,h10,i10,j10
Zone: rank9 = a9,b9,c9,d9,e9,f9,g9,h9,i9,j9
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,j2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Guard
Move: slide (H,V)
Capture: slide (D,A)
Symbol: "G", "G,g"
Value: 400

Piece: Ensign
Move: slide (D,A)
Capture: slide (H,V)
Symbol: "E", "E,e"
Value: 450

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-i1 with j1
Castle: white f1-c1 with a1
Castle: black f8-i8 with j8
Castle: black f8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank9, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank10, rank1, "QEGRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



#####################################################
# Diana Chess                                       #
# http://www.chessvariants.com/small.dir/diana.html #
#####################################################
Variant: diana
Board: 6x6
FEN: "rbnkbr/pppppp/6/6/PPPPPP/RBNKBR w - -"
XBoard pieces: "PNBR.Kpnbr.k"
Zone: rank6 = a6,b6,c6,d6,e6,f6
Zone: rank1 = a1,b1,c1,d1,e1,f1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 575

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 600

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 650

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
# Castling: does not work correctly in XBoard, which cannot place the king correctly
Castle: white d1-f1 with f1
Castle: white d1-a1 with a1
Castle: black d8-f8 with f8
Castle: black d8-a8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank6, rank1, "RBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



####################################################
# Sherwin's Chess                                  #
# http://talkchess.com/forum/viewtopic.php?t=58943 #
####################################################
Variant: Sherwin's Chess
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

# Define the pieces
Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Optional promotion: empty, rank2, "N"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



##################################
# Viceroy Chess                  #
# http://elajedrezdelvirrey.com/ #
##################################
Variant: Viceroy
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"
XBoard pieces: "PNBRQ.....VKpnbrq.....vk"
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rook8 = a8,h8
Zone: knight8 = b8,g8
Zone: bishop8 = c8,f8
Zone: queen8 = d8
Zone: viceroy8 = e8
Zone: rook1 = a1,h1
Zone: knight1 = b1,g1
Zone: bishop1 = c1,f1
Zone: queen1 = d1
Zone: viceroy1 = e1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Viceroy
Move: leap (0,1)|(1,1)
Symbol: "V", "V,v"
Value: 250

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rook8, rook1, "R"
Promotion: knight8, knight1, "N"
Promotion: bishop8, bishop1, "B"
Promotion: queen8, queen1, "Q"
Promotion: viceroy8, viceroy1, "V"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



#############################################################
# Chaturanga                                                #
# http://www.chessvariants.com/old.dir/chaturanga.html      #
# http://www.chessvariants.com/historic.dir/chaturanga.html #
#############################################################
Variant: chaturanga
Board: 8x8
FEN: "rnekfenr/pppppppp/8/8/8/8/PPPPPPPP/RNEFKENR w Ed"
XBoard pieces: "PN.R.FEKpn.r.fek"
XBoard parent: "shatranj"
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rook8 = a8,h8
Zone: knight8 = b8,g8
Zone: bishop8 = c8,f8
Zone: queen8 = e8
Zone: pawn8 = d8
Zone: rook1 = a1,h1
Zone: knight1 = b1,g1
Zone: bishop1 = c1,f1
Zone: queen1 = d1
Zone: pawn1 = e1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 600
Max: 2

Piece: Elephant
Move: leap (2,2)
Symbol: "E", "E,e"
Value: 150
Max: 2

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 1000
Max: 2

Piece: Ferz
Move: leap (1,1)
Symbol: "F", "F,f"
Value: 250
Max: 1

Piece: King
Move: leap (0,1)|(1,1)
Special: pawn1, pawn8, leap (2,1)
Symbol: "K", "K,k"
Flags: royal
Max: 1

Piece: Pawn
Move: step N
Capture: step NE,NW
Symbol: " ", "P,p"
Promotion: rook8, rook1, "R"
Promotion: knight8, knight1, "N"
Promotion: bishop8, bishop1, "E"
Promotion: queen8, queen1, "F"
Promotion: pawn8, pawn1, "K"
Value: 100

Rule: checkmate = win
Rule: stalemate = win
Rule: repeat3 = draw
Rule: bare rule
Rule: special init



##############################################################################################
# Some form of suicide chess                                                                 #
# Piece values from http://www.ke.tu-darmstadt.de/publications/papers/ICGA-ChessVariants.pdf #
##############################################################################################
Variant: suicide
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w - -"
XBoard pieces: "PNBRQKpnbrqk"
XBoard parent: "suicide"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: -320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: -450

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: -500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: -480

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Value: -300

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "KQRBN"
Value: -250

Rule: stalemate = loss
Rule: nopieces = win
Rule: repeat3 = draw
Rule: forced capture



###################################################################
# Roman Chess                                                     #
# http://www.chess10x10.com/10x10-chess-variants-Roman-Chess.html #
###################################################################
Variant: roman
Board: 10x10
FEN: "rnabqkbanr/pppppppppp/10/10/10/10/10/10/PPPPPPPPPP/RNABQKBANR w KQkq -"
XBoard pieces: "PNBRQ.....AKpnbrq.....ak"
Zone: rank9 = a9,b9,c9,d9,e9,f9,g9,h9,i9,j9
Zone: rank10 = a10,b10,c10,d10,e10,f10,g10,h10,i10,j10
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,h1
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,h2

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 300

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-i1 with j1
Castle: white f1-c1 with a1
Castle: black f10-i10 with j10
Castle: black f10-c10 with a10

Piece: Archer
Move: leap (0,1)|(1,1)
Symbol: "A", "A,a"
Value: 275

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank9, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank10, rank1, "RNABQ"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



########################################################################
# Schoolbook Chess                                                     #
# http://www.chessvariants.com/index/msdisplay.php?itemid=MSschoolbook #
########################################################################
Variant: Schoolbook (10x8)
Board: 10x8
FEN: "rqnbakbncr/pppppppppp/10/10/10/10/PPPPPPPPPP/RQNBAKBNCR w KQkq -"
XBoard pieces: "PNBRQ..ACKpnbrq..ack"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8,i8,j8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7,i7,j7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,j2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 275

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 350

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 475

Piece: Chancellor
Move: leap (2,1)
Move: slide (H,V)
Symbol: "C", "C,c"
Value: 875

Piece: Archbishop
Move: leap (2,1)
Move: slide (D,A)
Symbol: "A", "A,a"
Value: 825

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-i1,h1    with j1
Castle: white f1-c1,b1,d1 with a1
Castle: black f8-i8,h8    with j8
Castle: black f8-c8,b8,d8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QACRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



################################
# Supercapablanca Chess        #
# Pritchard, CECV section 14.1 #
################################
Variant: supercapablanca (12x8)
Board: 12x8
FEN: "rnbacqkgabnr/pppppppppppp/12/12/12/12/PPPPPPPPPPPP/RNBACQKGABNR w KQkq -"
XBoard pieces: "PNBRQ..AC......GKpnbrq..ac......gk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8,i8,j8,k8,l8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7,i7,j7,k7,l7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,j2,k2,l2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1,k1,l1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 275

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 350

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 475

Piece: Chancellor
Move: leap (2,1)
Move: slide (H,V)
Symbol: "C", "C,c"
Value: 875

Piece: Archbishop
Move: leap (2,1)
Move: slide (D,A)
Symbol: "A", "A,a"
Value: 825

Piece: General
Move: leap (2,1)
Move: slide (D,A,H,V)
Symbol: "G", "G,g"
Value: 1200

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Special: rank1, rank8, leap (2,1)
Castle: white g1-i1,j1,k1 with l1
Castle: white g1-e1,d1,c1 with a1
Castle: black g8-i8,j8,k8 with l8
Castle: black g8-e8,d8,c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "GQACRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw
Rule: special init



##########################################################
# Wildebeest Chess                                       #
# http://www.chessvariants.com/large.dir/wildebeest.html #
##########################################################
Variant: Wildebeest (11x10)
Board: 11x10
FEN: "rnccgkqbbnr/ppppppppppp/11/11/11/11/11/11/PPPPPPPPPPP/RNBBQKGCCNR w KQkq - 0 1"
XBoard pieces: "PNBRQ...................C......GKpnbrq...................c......gk"
Zone: rank10 = a10,b10,c10,d10,e10,f10,g10,h10,i10,j10,k10
Zone: rank9 = a9,b9,c9,d9,e9,f9,g9,h9,i9,j9,k9
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8,i8,j8,k8
Zone: rank3 = a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,k3
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2,i2,j2,k2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1,k1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 275

Piece: Camel
Move: leap (3,1)
Symbol: "C", "C,c"
Value: 225

Piece: Gnu
Move: leap (2,1)|(3,1)
Symbol: "G", "G,g"
Value: 700

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 350

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 475

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white f1-g1,h1,i1,j1 with k1
Castle: white f1-e1,d1,c1,b1 with a1
Castle: black f10-g10,h10,i10,j10 with k10
Castle: black f10-e10,d10,c10,b10 with a10

Piece: Pawn
Move: step N
Capture: step NE,NW
Initial: step 3N
Special: rank3, rank8, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank10, rank1, "GQCRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



####################### 
# WaShogi, with drops # 
####################### 
Variant: Wa-Shogi-drop (11x11) 
Board: 11x11 
FEN: "hmlcvkwgudo/1e3s3f1/ppprpppxppp/3p3p3/11/11/11/3P3P3/PPPXPPPRPPP/1F3S3E1/ODUGWKVCLMH w 0 1"
XBoard pieces: "P..^S^FV..^LW^OH.F.^R.E....R...D.GOL^M..^H.M.C.^CU.^W/.......^V.^P.^U..^DS.^GXKp..^s^fv..^lw^oh.f.^r.e....r...d.gol^m..^h.m.c.^cu.^w/.......^v.^p.^u..^ds.^gxk"
XBoard parent:  "chu" 
Zone: white_promotion = a11,b11,c11,d11,e11,f11,g11,h11,i11,j11,k11,a10,b10,c10,d10,e10,f10,g10,h10,i10,j10,k10,a9,b9,c9,d9,e9,f9,g9,h9,i9,j9,k9
Zone: black_promotion = a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,k3,a2,b2,c2,d2,e2,f2,g2,h2,i2,j2,k2,a1,b1,c1,d1,e1,f1,g1,h1,i1,j1,k1 

# crane King, K=King 
# cloud Eagle, E
# flying Falcon F promotes to *Tenacious Falcon 
# Swallows wings, S promotes to *Gliding Swallow 
# treacherous foX, X
# running Rabbit, R promotes to *Treacherous fox 
# violent Wolf, W promotes to *Bear's Eyes 
# Violent stag, V promotes to *Roaming Boar 
# flying Goose, G promotes to *Swallow's Wings 
# flying Cock, C promotes to *Raiding Falcon 
# strUtting crow, U promotes to *Flying Falcon 
# swooping owL, L promotes to *Cloud Eagle 
# blind Dog, D promotes to *Violent Wolf 
# climbing Monkey, M promotes to *Violent Stag 
# liberated Horse, H promotes to  *Heavenly Horse 
# Oxcart, O promotes to *Plodding Ox 
# sparrow Pawn, P=Pawn promotes to *Golden Bird 

Piece: Crane King 
Symbol: "K", "K,k" 
Move: leap (0,1)|(1,1) 
Flags: royal 

Piece: Cloud Eagle 
Symbol: "E", "E,e" 
Move: slide (V) 
Move: step W,E,SW,SE,3NW,3NE 
Value: 850 

Piece: Treacherous Fox 
Symbol: "X", "X,x" 
Move: aleap (1,1)|(2,2)|(-1,1)|(-2,2)|(1,-1)|(2,-2)|(-1,-1)|(-2,-2)|(0,1)|(0,2)|(0,-1)|(0,-2)
Value: 750 

Piece: Flying Falcon 
Symbol: "F", "F,f" 
Move: slide (D,A) 
Move: step N 
Promotion: white_promotion, black_promotion, "+" 
Value: 600 

Piece: Tenacious Falcon 
Symbol: "+F", "+F,+f" 
Move: slide (V,A,D) 
Move: step W,E 
Value: 700 

Piece: Running Rabbit 
Symbol: "R", "R,r" 
Move: step NE,NW,SE,S,SW,10N
Promotion: white_promotion, black_promotion, "+" 
Value: 400 

Piece: Promoted Running Rabbit 
Symbol: "+R", "+R,+r" 
Move: aleap (1,1)|(2,2)|(-1,1)|(-2,2)|(1,-1)|(2,-2)|(-1,-1)|(-2,-2)|(0,1)|(0,2)|(0,-1)|(0,-2)
Value: 750 

Piece: Violent Wolf 
Symbol: "W", "W,w" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Promotion: white_promotion, black_promotion, "+" 
Value: 400 

Piece: Bears Eyes 
Symbol: "+W", "+W,+w" 
Move: leap (0,1)|(1,1) 

Piece: Violent Stag 
Symbol: "V", "V,v" 
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Roaming Boar 
Symbol: "+V", "+V,+v" 
Move: aleap (1,0)|(-1,0)|(0,1)|(1,1)|(-1,1)|(-1,-1)|(1,-1)

Piece: Blind Dog 
Symbol: "D", "D,d" 
Move: aleap (-1,1)|(1,1)|(-1,0)|(1,0)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Blind Dog 
Symbol: "+D", "+D,+d" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)

Piece: Climbing Monkey 
Symbol: "M", "M,m" 
Move: aleap (-1,1)|(0,1)|(1,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Climbing Monkey 
Symbol: "+M", "+M,+m" 
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)

Piece: Flying Goose 
Symbol: "G", "G,g" 
Move: aleap (-1,1)|(0,1)|(1,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Flying Goose 
Symbol: "+G", "+G,+g" 
Move: slide (H) 
Move: aleap (0,1)|(0,-1)

Piece: Flying Cock 
Symbol: "C", "C,c" 
Move: aleap (-1,1)|(-1,0)|(1,1)|(1,0)
Promotion: white_promotion, black_promotion, "+" 

Piece: Raiding Falcon 
Symbol: "+C", "+C,+c" 
Move: aleap (-1,1)|(-1,0)|(1,1)|(1,0)
Move: slide (V)

Piece: Swallows Wings 
Symbol: "S", "S,s" 
Move: slide (H) 
Move: aleap (0,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Gliding Swallow 
Symbol: "+S", "+S,+s" 
Move: slide (H,V)

Piece: Strutting Crow 
Symbol: "U", "U,u" 
Move: aleap (-1,-1)|(1,-1)|(0,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Strutting Cow 
Symbol: "+U", "+U,+u" 
Move: slide (D,A) 
Move: step N 

Piece: Swooping Owl 
Symbol: "L", "L,l" 
Move: aleap (-1,-1)|(1,-1)|(0,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Cloud Eagle (Promoted Swooping Owl) 
Symbol: "+L", "+L,+l" 
Move: slide (V) 
Move: step W,E,SW,SE,3NW,3NE 

Piece: Liberated Horse 
Symbol: "H", "H,h" 
Move: step 10N,2S 
Promotion: white_promotion, black_promotion, "+" 

Piece: Heavenly Horse 
Symbol: "+H", "+H,+h" 
Move: aleap (1,2)|(-1,2)|(1,-2)|(-1,-2) 

Piece: Oxcart 
Symbol: "O", "O,o" 
Move: step 10N 
Promotion: white_promotion, black_promotion, "+" 

Piece: Plodding Ox (Promoted Oxcart) 
Symbol: "+O", "+O,+o" 
Move: leap (0,1)|(1,1) 

Piece: Sparrow Pawn 
Symbol: "P", "P,p" 
Move: step N
Promotion: white_promotion, black_promotion, "+" 
Flags: drop_no_mate, drop_one_file 
Value: 80 

Piece: Golden Bird (Promoted Sparrow Pawn)
Symbol: "+P", "+P,+p" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1) 
Value: 450 

Rule: keep capture, allow drops 
Rule: repeat4 = draw 
Rule: perpetual4 = loss 



########################## 
# WaShogi, without drops # 
########################## 
Variant: Wa-Shogi (11x11) 
Board: 11x11 
FEN: "hmlcvkwgudo/1e3s3f1/ppprpppxppp/3p3p3/11/11/11/3P3P3/PPPXPPPRPPP/1F3S3E1/ODUGWKVCLMH w 0 1"
XBoard pieces: "P..^S^FV..^LW^OH.F.^R.E....R...D.GOL^M..^H.M.C.^CU.^W/.......^V.^P.^U..^DS.^GXKp..^s^fv..^lw^oh.f.^r.e....r...d.gol^m..^h.m.c.^cu.^w/.......^v.^p.^u..^ds.^gxk"
XBoard parent:  "chu" 
Zone: white_promotion = a11,b11,c11,d11,e11,f11,g11,h11,i11,j11,k11,a10,b10,c10,d10,e10,f10,g10,h10,i10,j10,k10,a9,b9,c9,d9,e9,f9,g9,h9,i9,j9,k9
Zone: black_promotion = a3,b3,c3,d3,e3,f3,g3,h3,i3,j3,k3,a2,b2,c2,d2,e2,f2,g2,h2,i2,j2,k2,a1,b1,c1,d1,e1,f1,g1,h1,i1,j1,k1 

# crane King, K=King 
# cloud Eagle, E
# flying Falcon F promotes to *Tenacious Falcon 
# Swallows wings, S promotes to *Gliding Swallow 
# treacherous foX, X
# running Rabbit, R promotes to *Treacherous fox 
# violent Wolf, W promotes to *Bear's Eyes 
# Violent stag, V promotes to *Roaming Boar 
# flying Goose, G promotes to *Swallow's Wings 
# flying Cock, C promotes to *Raiding Falcon 
# strUtting crow, U promotes to *Flying Falcon 
# swooping owL, L promotes to *Cloud Eagle 
# blind Dog, D promotes to *Violent Wolf 
# climbing Monkey, M promotes to *Violent Stag 
# liberated Horse, H promotes to  *Heavenly Horse 
# Oxcart, O promotes to *Plodding Ox 
# sparrow Pawn, P=Pawn promotes to *Golden Bird 

Piece: Crane King 
Symbol: "K", "K,k" 
Move: leap (0,1)|(1,1) 
Flags: royal 

Piece: Cloud Eagle 
Symbol: "E", "E,e" 
Move: slide (V) 
Move: step W,E,SW,SE,3NW,3NE 
Value: 850 

Piece: Treacherous Fox 
Symbol: "X", "X,x" 
Move: aleap (1,1)|(2,2)|(-1,1)|(-2,2)|(1,-1)|(2,-2)|(-1,-1)|(-2,-2)|(0,1)|(0,2)|(0,-1)|(0,-2)
Value: 750 

Piece: Flying Falcon 
Symbol: "F", "F,f" 
Move: slide (D,A) 
Move: step N 
Promotion: white_promotion, black_promotion, "+" 
Value: 600 

Piece: Tenacious Falcon 
Symbol: "+F", "+F,+f" 
Move: slide (V,A,D) 
Move: step W,E 
Value: 700 

Piece: Running Rabbit 
Symbol: "R", "R,r" 
Move: step NE,NW,SE,S,SW,10N
Promotion: white_promotion, black_promotion, "+" 
Value: 400 

Piece: Promoted Running Rabbit 
Symbol: "+R", "+R,+r" 
Move: aleap (1,1)|(2,2)|(-1,1)|(-2,2)|(1,-1)|(2,-2)|(-1,-1)|(-2,-2)|(0,1)|(0,2)|(0,-1)|(0,-2)
Value: 750 

Piece: Violent Wolf 
Symbol: "W", "W,w" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)
Promotion: white_promotion, black_promotion, "+" 
Value: 400 

Piece: Bears Eyes 
Symbol: "+W", "+W,+w" 
Move: leap (0,1)|(1,1) 

Piece: Violent Stag 
Symbol: "V", "V,v" 
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Roaming Boar 
Symbol: "+V", "+V,+v" 
Move: aleap (1,0)|(-1,0)|(0,1)|(1,1)|(-1,1)|(-1,-1)|(1,-1)

Piece: Blind Dog 
Symbol: "D", "D,d" 
Move: aleap (-1,1)|(1,1)|(-1,0)|(1,0)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Blind Dog 
Symbol: "+D", "+D,+d" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1)

Piece: Climbing Monkey 
Symbol: "M", "M,m" 
Move: aleap (-1,1)|(0,1)|(1,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Climbing Monkey 
Symbol: "+M", "+M,+m" 
Move: aleap (0,1)|(1,1)|(1,-1)|(-1,-1)|(-1,1)

Piece: Flying Goose 
Symbol: "G", "G,g" 
Move: aleap (-1,1)|(0,1)|(1,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Flying Goose 
Symbol: "+G", "+G,+g" 
Move: slide (H) 
Move: aleap (0,1)|(0,-1)

Piece: Flying Cock 
Symbol: "C", "C,c" 
Move: aleap (-1,1)|(-1,0)|(1,1)|(1,0)
Promotion: white_promotion, black_promotion, "+" 

Piece: Raiding Falcon 
Symbol: "+C", "+C,+c" 
Move: aleap (-1,1)|(-1,0)|(1,1)|(1,0)
Move: slide (V)

Piece: Swallows Wings 
Symbol: "S", "S,s" 
Move: slide (H) 
Move: aleap (0,1)|(0,-1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Gliding Swallow 
Symbol: "+S", "+S,+s" 
Move: slide (H,V)

Piece: Strutting Crow 
Symbol: "U", "U,u" 
Move: aleap (-1,-1)|(1,-1)|(0,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Promoted Strutting Cow 
Symbol: "+U", "+U,+u" 
Move: slide (D,A) 
Move: step N 

Piece: Swooping Owl 
Symbol: "L", "L,l" 
Move: aleap (-1,-1)|(1,-1)|(0,1)
Promotion: white_promotion, black_promotion, "+" 

Piece: Cloud Eagle (Promoted Swooping Owl) 
Symbol: "+L", "+L,+l" 
Move: slide (V) 
Move: step W,E,SW,SE,3NW,3NE 

Piece: Liberated Horse 
Symbol: "H", "H,h" 
Move: step 10N,2S 
Promotion: white_promotion, black_promotion, "+" 

Piece: Heavenly Horse 
Symbol: "+H", "+H,+h" 
Move: aleap (1,2)|(-1,2)|(1,-2)|(-1,-2) 

Piece: Oxcart 
Symbol: "O", "O,o" 
Move: step 10N 
Promotion: white_promotion, black_promotion, "+" 

Piece: Plodding Ox (Promoted Oxcart) 
Symbol: "+O", "+O,+o" 
Move: leap (0,1)|(1,1) 

Piece: Sparrow Pawn 
Symbol: "P", "P,p" 
Move: step N
Promotion: white_promotion, black_promotion, "+" 
Flags: drop_no_mate, drop_one_file 
Value: 80 

Piece: Golden Bird (Promoted Sparrow Pawn)
Symbol: "+P", "+P,+p" 
Move: aleap (1,0)|(-1,0)|(0,1)|(0,-1)|(1,1)|(-1,1) 
Value: 450 

Rule: repeat4 = draw 
Rule: perpetual4 = loss 



######################################################################
# Theban Chess, http://www.talkchess.com/forum/viewtopic.php?t=52277 #
######################################################################
Variant: Theban
Board: 8x8
FEN: "1p6/2p3kn/3p2pp/4pppp/5ppp/8/PPPPPPPP/PPPPPPKN w - - 0 1"
XBoard pieces: "PNBRQKpnbrqk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal

Piece: Pawn
Move: step N
Capture: step NE,NW
Special: rank2, rank7, step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



####################
# Nightrider chess #
####################
Variant: Nightrider (8x8)
Board: 8x8
FEN: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -"
XBoard pieces: "P.BRQ.......NKp.brq.......nk"
Zone: rank8 = a8,b8,c8,d8,e8,f8,g8,h8
Zone: rank7 = a7,b7,c7,d7,e7,f7,g7,h7
Zone: rank2 = a2,b2,c2,d2,e2,f2,g2,h2
Zone: rank1 = a1,b1,c1,d1,e1,f1,g1,h1

Piece: Nightrider
Move: ride (2,1)
Symbol: "N", "N,n"
Value: 550

Piece: Bishop
Move: slide (D,A)
Symbol: "B", "B,b"
Value: 325

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Value: 950

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Flags: royal
Castle: white e1-g1 with h1
Castle: white e1-c1 with a1
Castle: black e8-g8 with h8
Castle: black e8-c8 with a8

Piece: Pawn
Move: step N
Capture: step NE,NW
Initial: step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank8, rank1, "QRBN"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw



#######################################################
# Caissa Britannia                                    #
# http://www.chessvariants.com/large.dir/british.html #
#######################################################
Variant: Caissa Britannia (10x10)
Board: 10x10
FEN: "drubqkburd/1l6l1/pppppppppp/10/10/10/10/PPPPPPPPPP/1L6L1/DRUBQKBURD[NNNNNNNNNNnnnnnnnnnn] w - - 0 1"
XBoard parent: "grand"
XBoard pieces: "PNBRQ...............U.........D.LKpnbrq...............u.........d.lk"
Zone: rank10 = a10,b10,c10,d10,e10,f10,g10,h10,i10,j10
Zone: rank1  = a1,b1,c1,d1,e1,f1,g1,h1,i1,j1

Piece: Knight
Move: leap (2,1)
Symbol: "N", "N,n"
Value: 320

Piece: Unicorn
Move: slide (D,A)
Move: ride (2,1)
Symbol: "U", "U,u"
Value: 925
Max: 2

Piece: Dragon
Move: ride (0,2)|(2,2)
Symbol: "D", "D,d"
Value: 300
Max: 2

Piece: Lion
Move: slide (A,D,H,V)
Capture: hop (A,D,H,V)
Symbol: "L", "L,l"
Value: 475
Max: 2

Piece: Bishop
Move: slide (D,A)
Move: leap (1,0)
Capture: slide (D,A)
Symbol: "B", "B,b"
Value: 325
Max: 2

Piece: Rook
Move: slide (H,V)
Symbol: "R", "R,r"
Value: 500
Max: 2

Piece: Queen
Move: slide (D,A,H,V)
Symbol: "Q", "Q,q"
Flags: royal

Piece: King
Move: leap (0,1)|(1,1)
Symbol: "K", "K,k"
Value: 250
Max: 2

Piece: Pawn
Move: step N
Capture: step NE,NW
Initial: step 2N
Symbol: " ", "P,p"
Flags: set_ep,take_ep
Promotion: rank10, rank1, "RBNUDKL"
Value: 100

Rule: checkmate = win
Rule: stalemate = draw
Rule: repeat3 = draw
Rule: en-passant check



