King Support Chess
This variant is an attempt to mend some drawbacks of orthodox Chess.
A pawn supported by the King can capture orthogonally forward also. That helps to break up interlocked pawn structures and makes it more difficult to block a passed pawn. Thus it can be expected that several positions that would normally be drawn are now decided and that the game is less drawish.
The rule structure is improved by replacing en passant capture and castling by rules that make the set of allowed moves independent from the past moves. The position alone determines what moves are legal, and the past moves are relevant only for the repetition rule and the 50 moves rule.
Rules
Same as orthodox Chess, with the following exceptions:
A pawn can make a double move only if the square to leap over is not attacked by an opponent's pawn i. e. if no opponent's pawn is beside the destination square (on same row and adjacent). This rule makes the en passant capture obsolet.
A pawn that is orthogonally or diagonally adjacent to the friendly King may capture to the square orthogonally in front of it, what also means that it gives check if the opponent's King is on that square. But it may not make a capturing double move.
Castling is replaced by the King swap: If the King of a side is on the origin square (e1 for white and e8 for black), then the King can swap places with a friendly piece on the same row, if no other piece is in between and the King is not in check and would not cross a square attacked by the opponent. This swap counts as a complete move. It can be done even if King and participating piece have previously moved, what also means that a side can make the King swap more than once in a game.
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By Thomas .
Web page created: 2024-02-26. Web page last updated: 2024-05-10