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Update castling rights unconditionally.

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passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 163680 W: 42214 L: 42137 D: 79329
Ptnml(0-2): 454, 18054, 44734, 18157, 441
https://tests.stockfishchess.org/tests/view/697e6f4e5f56030af97b5a3c

closes https://github.com/official-stockfish/Stockfish/pull/6588

No functional change
This commit is contained in:
Pieter te Brake
2026-02-04 18:22:07 +01:00
committed by Joost VandeVondele
parent 2321cf2f77
commit 24af6a6bc4
1 changed files with 4 additions and 7 deletions
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src/position.cpp
+4 -7
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@@ -819,13 +819,10 @@ void Position::do_move(Move m,
st->epSquare = SQ_NONE;
}
// Update castling rights if needed
if (st->castlingRights && (castlingRightsMask[from] | castlingRightsMask[to]))
{
k ^= Zobrist::castling[st->castlingRights];
st->castlingRights &= ~(castlingRightsMask[from] | castlingRightsMask[to]);
k ^= Zobrist::castling[st->castlingRights];
}
// Update castling rights.
k ^= Zobrist::castling[st->castlingRights];
st->castlingRights &= ~(castlingRightsMask[from] | castlingRightsMask[to]);
k ^= Zobrist::castling[st->castlingRights];
// Move the piece. The tricky Chess960 castling is handled earlier
if (m.type_of() != CASTLING)