Community variant

Decimal Shogi

10x10 Shogi with Queen and stronger promoted minor pieces

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.

Uploaded by: gbtami
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), queen (q), rook (r), bishop (b), knight (n), pawn (p), piece (l), piece (s) and piece (g).
Piece v is a custom piece with Betza movement `WvR`.
Piece j is a custom piece with Betza movement `N`.
Piece e is a custom piece with Betza movement `FfsW`.
Piece f is a custom piece with Betza movement `WfF`.

Drops and hands

Pieces in hand can be dropped back onto the board. Droppable pieces are: king (k), queen (q), rook (r), bishop (b), knight (n), pawn (p), piece (l), piece (s) and piece (g).

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: piece (l), knight (n), piece (s), piece (g), pawn (p), bishop (b) and rook (r).
Fixed promotion mappings: l promotes to v, n promotes to j, s promotes to f, g promotes to e, p promotes to g, b promotes to h and r promotes to d.

Custom piece movement

These diagrams show the basic movement pattern from White's perspective on a compact preview board. Some special moves, especially hoppers, can still depend on blockers or game state.

Custom piece 1 (V) movement WvR

Custom piece 2 (J) movement N

Custom piece 3 (E) movement FfsW

Custom piece 4 (F) movement WfF

move capture move or capture initial only hopper target

Fairy-Stockfish rules

[decimalshogi:shogi]
maxRank = 10
maxFile = 10
queen = q
# Lance promotes to Vertical Mover
customPiece1 = v:WvR
# Shogi Knight promotes to Jumping Horse
customPiece2 = j:N
# Gold General promotes to Drunk Elephant
customPiece3 = e:FfsW
# Silver General promotes to a new Gold piece to prevent promotion chaining
customPiece4 = f:WfF
promotedPieceType = l:v n:j s:f g:e p:g b:h r:d
promotionRegionWhite = *8 *9 *10
promotionRegionBlack = *1 *2 *3
startFen = lnsgqkgsnl/1r6b1/pppppppppp/10/10/10/10/PPPPPPPPPP/1B6R1/LNSGKQGSNL[-] w 0 1