Community variant
Okisaki Shogi
Fairy-Stockfish built-in variant exposed as a casual community variant.
References:
Wikipedia
This is a curated Fairy-Stockfish built-in variant. Gameplay uses Fairy-Stockfish's canonical built-in definition.
The documentation block below mirrors the relevant built-in settings for the generated overview and movement diagrams.
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), Queen (q), rook (r), bishop (b), Jumping horse (n), shogi pawn (p), Two-way lance (l), silver (s) and gold (g).
- Two-way lance (l) is a custom piece with Betza movement `vR`.
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: Queen (q), rook (r), bishop (b), Jumping horse (n), shogi pawn (p), Two-way lance (l), silver (s) and gold (g).
- Captured pieces go to the capturer's hand.
- Drops of shogi pawn (p) are restricted on files that already contain 1 such piece(s).
- 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 8 to 10 and the promotion region for Black is all the ranks from 1 to 3.
- The pieces that can promote are: shogi pawn (p), Two-way lance (l), Jumping horse (n), silver (s), bishop (b) and rook (r).
- Fixed promotion mappings: p promotes to g, l promotes to g, n promotes to g, s promotes to g, b promotes to h and r promotes to d.
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 draw.
- 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.
vR
move
capture
move or capture
initial only
hopper target
Fairy-Stockfish rule documentation
[okisakishogi]
variantTemplate = shogi
maxRank = 10
maxFile = 10
king = k
shogiPawn = p
silver = s
gold = g
bishop = b
dragonHorse = h
rook = r
bers = d
customPiece1 = l:vR
knight = n
queen = q
promotionRegionWhite = *8 *9 *10
promotionRegionBlack = *1 *2 *3
promotedPieceType = p:g l:g n:g s:g b:h r:d
pieceDrops = true
capturesToHand = true
doubleStep = false
castling = false
dropNoDoubled = p
immobilityIllegal = true
shogiPawnDropMateIllegal = true
stalemateValue = loss
nFoldRule = 4
nMoveRule = 0
perpetualCheckIllegal = true