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 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

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]
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