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Crazyhouse en passant bug with DropMove #23

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dbergan opened this issue Apr 17, 2023 · 0 comments · Fixed by dbergan/dartchess#2 · May be fixed by #24
Open

Crazyhouse en passant bug with DropMove #23

dbergan opened this issue Apr 17, 2023 · 0 comments · Fixed by dbergan/dartchess#2 · May be fixed by #24

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@dbergan
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dbergan commented Apr 17, 2023

_copyWith() carries the epSquare forward to the next move when a DropMove is played, which makes this sequence possible:

  1. d4 e5
  2. Nf3 Qg5
  3. Nxg5 Be7
  4. dxe5 Bd8
  5. Nc3 f5 (creates epSquare at f6)
  6. Q@f7 (copyWith() is given null for epSquare, which then copies the epSquare of f6 forward to Black)
    6... gxf6 (captures the Queen on f7!)
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@dbergan