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Fix nonPawnKey

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Fix incorrect nonPawnKey update

Passed non-reg SMP STC:
```
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 139424 W: 35792 L: 35690 D: 67942
Ptnml(0-2): 197, 15783, 37665, 15855, 212
```
https://tests.stockfishchess.org/tests/view/694b7b7e572093c1986d6b0d

Passed non-reg SMP LTC:
```
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88880 W: 22863 L: 22718 D: 43299
Ptnml(0-2): 16, 8947, 26401, 9028, 48
```
https://tests.stockfishchess.org/tests/view/694d2ceb572093c1986d6fc8

fixes https://github.com/official-stockfish/Stockfish/issues/6492

closes https://github.com/official-stockfish/Stockfish/pull/6494

Bench: 2475788
This commit is contained in:
KazApps
2025-12-28 14:55:47 +01:00
committed by Disservin
parent 1047f844d1
commit b2e60960b3
2 changed files with 2 additions and 1 deletions
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src/position.cpp
+1
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@@ -855,6 +855,7 @@ void Position::do_move(Move m,
k ^= Zobrist::psq[promotion][to];
st->materialKey ^= Zobrist::psq[promotion][8 + pieceCount[promotion] - 1]
^ Zobrist::psq[pc][8 + pieceCount[pc]];
st->nonPawnKey[us] ^= Zobrist::psq[promotion][to];
if (promotionType <= BISHOP)
st->minorPieceKey ^= Zobrist::psq[promotion][to];