Community variant

Yari 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.

Uploaded by: Fairy-Stockfish
Visibility: public
Status: active

Generated rule overview

This variant inherits its base rules from `shogi` and overrides the settings shown below.

Board and setup

Default starting position

Pieces and movement

The piece set used on the board is: king (k), custom piece 3 (r), custom piece 2 (b), custom piece 1 (n) and shogi pawn (p).
custom piece 1 (n) is a custom piece with Betza movement `fRffN`.
custom piece 2 (b) is a custom piece with Betza movement `fFfR`.
custom piece 3 (r) is a custom piece with Betza movement `frlR`.
custom piece 4 (g) is a custom piece with Betza movement `WfFbR`.
custom piece 5 (s) is a custom piece with Betza movement `fKbR`.

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: custom piece 3 (r), custom piece 2 (b), custom piece 1 (n) and shogi pawn (p).
Captured pieces go to the capturer's hand.
Drops of shogi pawn (p) are restricted on files that already contain 1 such piece(s).

Promotion

Promotions are available in the configured promotion zones. The the promotion region for White is all the ranks from 7 to 9 and the promotion region for Black is all the ranks from 1 to 3.
The pieces that can promote are: shogi pawn (p), custom piece 1 (n), custom piece 2 (b) and custom piece 3 (r).
Fixed promotion mappings: p promotes to s, n promotes to g, b promotes to g and r promotes to l.

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 3-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.

Custom piece 1 (N) movement

fRffN

Custom piece 2 (B) movement

fFfR

Custom piece 3 (R) movement

frlR

Custom piece 4 (G) movement

WfFbR

Custom piece 5 (S) movement

fKbR

move capture move or capture initial only hopper target

Fairy-Stockfish rule documentation

[yarishogi:shogi]
maxRank = 9
maxFile = 7
startFen = rnnkbbr/7/ppppppp/7/7/7/PPPPPPP/7/RBBKNNR[-] w 0 1
shogiPawn = p
rook = l
customPiece1 = n:fRffN  # Yari knight
customPiece2 = b:fFfR   # Yari bishop
customPiece3 = r:frlR   # Yari rook
customPiece4 = g:WfFbR  # Yari gold
customPiece5 = s:fKbR   # Yari silver
promotionRegionWhite = *7 *8 *9
promotionRegionBlack = *1 *2 *3
promotedPieceType = p:s n:g b:g r:l
pieceDrops = true
capturesToHand = true
doubleStep = false
castling = false
dropNoDoubled = p
immobilityIllegal = true
shogiPawnDropMateIllegal = false
stalemateValue = loss
nFoldRule = 3
nMoveRule = 0
perpetualCheckIllegal = true