Community variant
Mixed Chess V5
a mix of shogi, shatranj and western chess
This is a user-catalogued casual variant. Technical details such as board size, FEN, pieces, and hand rules are defined in the Fairy-Stockfish variants.ini block below.
Generated rule overview
This variant is defined directly from a Fairy-Stockfish rule block. The text below is generated from the available configuration and may omit details that are only implicit in piece movement notation.
Board and setup
Pieces and movement
- The piece set used on the board is: king (k), rook (r), bishop (b), knight (n), pawn (p), commoner (c), flower (f) and pyramid (y).
- pawn (p) is a custom piece with Betza movement `fW`.
- pyramid (y) is a custom piece with Betza movement `fRW`.
- flower (f) is a custom piece with Betza movement `AFfW`.
Move rules
- Castling is not allowed.
- Pawn double-step moves are disabled.
- A piece may not move to a square where it would have no legal future movement.
Drops and hands
- Pieces in hand can be dropped back onto the board. Droppable pieces are: rook (r), bishop (b), knight (n), pawn (p), commoner (c), flower (f) and pyramid (y).
- Captured pieces go to the capturer's hand.
- Drops of pawn (p) are restricted on files that already contain 1 such piece(s).
- Pawn drops into the promotion zone are allowed.
- Checkmate by dropping a shogi pawn is illegal.
Promotion
- Promotions are available in the configured promotion zones. The the promotion region for White is all the ranks from 6 to 8 and the promotion region for Black is all the ranks from 1 to 3.
- The pieces that can promote are: pawn (p).
- Fixed promotion mappings: p promotes to c.
- Pawn promotion is mandatory when a pawn reaches the last rank/required zone.
Winning and losing
- Stalemate is scored as a loss for the side to move.
Draws and adjudication
- There is no automatic n-move/50-move draw rule.
- Position repetition is adjudicated after 4-fold repetition as a loss for the side to move.
- Perpetual check is illegal.
Piece movement
These diagrams show custom pieces and known Fairy-Stockfish built-in fairy pieces from White's perspective on a compact preview board. Some special moves, especially hoppers and game-state-dependent moves, can still depend on blockers or game state.
fW
fRW
AFfW
move
capture
move or capture
initial only
hopper target
Fairy-Stockfish rules
[mixedchess_v5]
maxFile = h
maxRank = 8
knight = n
bishop = b
rook = r
king = k
commoner = c
customPiece1 = p:fW
customPiece2 = y:fRW
customPiece3 = f:AFfW
startFen = ynfckfny/1r4b1/pppppppp/8/8/PPPPPPPP/1B4R1/YNFKCFNY w - - 0 1
pawnTypes = p
doubleStep = false
promotionRegionWhite = *6 *7 *8
promotionRegionBlack = *1 *2 *3
promotionPawnTypes = p
promotedPieceType = p:c
mandatoryPawnPromotion = true
pieceDrops = true
capturesToHand = true
dropNoDoubled = p
dropNoDoubledCount = 1
firstRankPawnDrops = false
promotionZonePawnDrops = true
shogiPawnDropMateIllegal = true
castling = false
immobilityIllegal = true
stalemateValue = loss
nFoldRule = 4
nFoldValue = loss
nFoldValueAbsolute = true
nMoveRule = 0
perpetualCheckIllegal = true