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Fix sometimes incorrect key for prefetches

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STC
https://tests.stockfishchess.org/tests/view/61737b4f6ce927be32558401
LLR: 2.95 (-2.94,2.94) <-2.50,0.50>
Total: 138712 W: 34914 L: 34942 D: 68856
Ptnml(0-2): 421, 14817, 38894, 14817, 407

Very minor tweak since Position::key() depends on the 50 move rule counter.
Comments: https://github.com/mstembera/Stockfish/commit/cddde31eed505cdf0c4fc8ff96b89f6e39c797e1

closes https://github.com/official-stockfish/Stockfish/pull/3759

No functional change
This commit is contained in:
mstembera
2021-10-22 20:01:05 -07:00
committed by Stéphane Nicolet
parent 2c86ae196d
commit 385deefd80
1 changed files with 1 additions and 1 deletions
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src/position.cpp
+1 -1
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@@ -1013,9 +1013,9 @@ void Position::do_null_move(StateInfo& newSt) {
}
st->key ^= Zobrist::side;
++st->rule50;
prefetch(TT.first_entry(key()));
++st->rule50;
st->pliesFromNull = 0;
sideToMove = ~sideToMove;