-"Capture" Chess (idea of opperwezen, maybe not new): captures are forced,
-but the goal is still to checkmate (not lose all material).
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-Cannibal Chess with forced captures.
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-Knightrelay: implement "official" version as Knightrelay v1
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-Antiking: implement v1 (deterministic) https://www.chessvariants.com/diffobjective.dir/anti-king-chess.html
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-S-chess https://en.wikipedia.org/wiki/Seirawan_chess
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-Generator variant, called "Matrix" ?
-Peces on first rank never move but generate new pieces. Pawn don't generate.
-A generator captured and replaced by a similar piece does not generate.
-King does not generate. No castling. En passant possible?
-Goal is still checkmate.
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-Take(a)n(d)make : if capture a piece, take its power for the last of the turn and make a move like it.
-If a pawn taken: direction of the capturer.
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-Maxima, Interweave, Roccoco
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-Synchrone Chess: allow to anticipate en-passant capture as well :)
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-Dynamo chess