Community variant
praetorianwithcastling
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 inherits its base rules from `chess` and overrides the settings shown below.
Board and setup
Pieces and movement
- The piece set used on the board is: king (k), queen (q), rook (r), bishop (b), knight (n), pawn (p), custom piece 15 (w), custom piece 14 (v), bers (x) and custom piece 8 (i).
- custom piece 8 (i) is a custom piece with Betza movement `mBcR`.
- custom piece 14 (v) is a custom piece with Betza movement `mRcB`.
- custom piece 15 (w) is a custom piece with Betza movement `mRcK`.
Move rules
- Castling is allowed.
Promotion
- The pieces that can promote are: pawn (p).
- Promotion choices are both sides: queen (q), rook (r), bishop (b) and knight (n).
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.
mBcR
mRcB
mRcK
move
capture
move or capture
initial only
hopper target
Fairy-Stockfish rules
[praetorianwithcastling:chess]
# Classical pieces
knight = n
bishop = b
rook = r
king = k
# Move/capture hybrids
customPiece8 = i:mBcR
customPiece14 = v:mRcB
customPiece15 = w:mRcK
# Built-in compound pieces
queen = q
bers = x
# Pawn and promotion rules
pawnTypes = p
promotionPieceTypes = qrbn
# The experiment has castling
castling = true
# Classical White vs vdrnkrdv Black
startFen = vwxikxwv/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w - - 0 1