Community variant
Douglas Modern chess
https://www.chessvariants.com/rules/douglas-modern-chess
The rules are as per standard chess.
Castling: A consquence of the start position is that there is no castling, although human players may agree to allow castling on the queen's side in a manner analagous to castling on the king's side in regular chess.
Pawns: pawns on the 3 and 6 ranks make an initial move of 1 step. Pawns on 2 and 7 rank may make an intial 2-step move.
En passant: en passant works as normal, but only for the pawns that started on ranks 2 and 7, as per normal chess.
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) and pawn (p).
Move rules
- Castling is not allowed.
- En passant is restricted to the configured target region.
Fairy-Stockfish rules
[douglasmodernchess2:chess]
startFen = 1rbqkbr1/1nppppn1/2pppp2/8/8/2PPPP2/1NPPPPN1/1RBQKBR1 w - - 0 1
castling = false
enPassantRegionWhite = *5
enPassantRegionBlack = *4
doubleStepRegionWhite = *3
doubleStepRegionBlack = *6