Community variant
Courthrone
A chess variant with 4 types of queen class hoppers.
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), queen (q), custom piece 4 (b), knight (n), custom piece 2 (p), custom piece 3 (d), custom piece 1 (v), custom piece 6 (t), custom piece 7 (l) and custom piece 8 (z).
- custom piece 1 (v) is a custom piece with Betza movement `fFfsW`.
- custom piece 2 (p) is a custom piece with Betza movement `pQ`.
- custom piece 3 (d) is a custom piece with Betza movement `mQcpQ`.
- custom piece 4 (b) is a custom piece with Betza movement `cQmpQ`.
- custom piece 5 (e) is a custom piece with Betza movement `QpQ`.
- custom piece 6 (t) is a custom piece with Betza movement `AD`.
- custom piece 7 (l) is a custom piece with Betza movement `mNcAcD`.
- custom piece 8 (z) is a custom piece with Betza movement `cNmAmD`.
- custom piece 9 (h) is a custom piece with Betza movement `NAD`.
Move rules
- Castling is not allowed.
- Pawn double-step moves are disabled.
Drops and hands
- Pieces in hand can be dropped back onto the board. Droppable pieces are: knight (n), custom piece 6 (t), custom piece 7 (l), custom piece 8 (z), queen (q), custom piece 4 (b), custom piece 2 (p), custom piece 3 (d) and custom piece 1 (v).
- Captured pieces go to the capturer's hand.
Promotion
- Promotions are available in the configured promotion zones. The the promotion region for White is all squares on rank 9 and the promotion region for Black is all squares on rank 1.
- The pieces that can promote are: custom piece 1 (v), queen (q), custom piece 2 (p), custom piece 3 (d), custom piece 4 (b), knight (n), custom piece 6 (t), custom piece 7 (l) and custom piece 8 (z).
- Fixed promotion mappings: v promotes to g, q promotes to e, p promotes to e, d promotes to e, b promotes to e, n promotes to h, t promotes to h, l promotes to h and z promotes to h.
- Piece promotion is mandatory where promotion is legal.
Winning and losing
- A flag/goal-zone win is active for piece(s) k.
- 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 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.
fFfsW
pQ
mQcpQ
cQmpQ
QpQ
AD
mNcAcD
cNmAmD
NAD
move
capture
move or capture
initial only
hopper target
Fairy-Stockfish rules
[courthrone]
variantTemplate = shogi
maxFile = 9
maxRank = 9
pocketSize = 9
startFen = qpbdkdbpq/9/v1v1v1v1v/9/9/9/V1V1V1V1V/9/QPBDKDBPQ[NTLZntlz] w - - 0 1
customPiece1 = v:fFfsW
commoner = g
queen = q
customPiece2 = p:pQ
customPiece3 = d:mQcpQ
customPiece4 = b:cQmpQ
customPiece5 = e:QpQ
knight = n
customPiece6 = t:AD
customPiece7 = l:mNcAcD
customPiece8 = z:cNmAmD
customPiece9 = h:NAD
king = k
pieceDrops = true
capturesToHand = true
promotionRegionWhite = *9
promotionRegionBlack = *1
promotedPieceType = v:g q:e p:e d:e b:e n:h t:h l:h z:h
mandatoryPiecePromotion = true
stalemateValue = loss
nMoveRule = 0
nFoldRule = 3
nFoldValue = loss
perpetualCheckIllegal = true
castling = false
doubleStep = false
flagPiece = k
flagRegionWhite = *9
flagRegionBlack = *1