bug: In the make_move function, line 934 sets castling[us] = '' (an e…#14

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MJ14222 wants to merge 2 commits intozeyu2001:mainfrom

MJ14222:fix/generate-fen-castling

Commits on Feb 5, 2026

bug: In the make_move function, line 934 sets castling[us] = '' (an empty string) which should be castling[us] = 0 (zero). This causes the castling flags to break because the code checks bitwise flags
MJ14222
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Commits on Feb 27, 2026

Fix castling flag bug and add verification description
MJ14222
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