Community variant
Stack 4
Stack four pieces vertically to win
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
- The variant supports Chess960-style castling.
Pieces and movement
- The piece set used on the board is: custom piece 2 (b), custom piece 1 (a) and custom piece 3 (c).
- custom piece 1 (a) is a custom piece with Betza movement `mKmNmA`.
- custom piece 2 (b) is a custom piece with Betza movement `mKmNcfW`.
- custom piece 3 (c) is a custom piece with Betza movement `K`.
Drops and hands
- Pieces in hand can be dropped back onto the board. Droppable pieces are: custom piece 2 (b), custom piece 1 (a) and custom piece 3 (c).
- Captured pieces go to the capturer's hand.
Promotion
- The pieces that can promote are: custom piece 2 (b).
- Fixed promotion mappings: b promotes to d.
Winning and losing
- A player can win by connecting 4 pieces vertically.
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.
mKmNmA
mKmNcfW
K
move
capture
move or capture
initial only
hopper target
Fairy-Stockfish rules
[stack-4]
customPiece1 = a:mKmNmA
customPiece2 = b:mKmNcfW
customPiece3 = c:K
customPiece4 = d:
maxRank = 6
startFen = bbaca+bc+b/8/8/8/8/BBACA+BC+B w
chess960 = true
connectN = 4
connectHorizontal = false
connectDiagonal = false
promotedPieceType = b:d
capturesToHand = true
pieceDrops = true