dartchess
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Impossible en passant capture that blocks a check
Closes #14
Fix related to that perft test:
id align-ep
epd 8/8/8/1k6/3Pp3/8/8/4KQ2 b - d3
perft 1 6
perft 2 121
perft 3 711
in chessops, i went for https://github.com/niklasf/chessops/commit/70a7452f931e07316be014cdaf677e4836396199