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Make key_after() more consistent with key()

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STC: https://tests.stockfishchess.org/tests/view/62f8547123d42b50a8dac674
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
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A bug fix plus non functional speed optimization. Position::key_after(Move m) is now
consistent with Position::key() thus prefetching correct TT entries which speeds things up.
Related PR #3759

closes https://github.com/official-stockfish/Stockfish/pull/4130

No functional change
This commit is contained in:
mstembera
2022-08-13 17:01:11 -07:00
committed by Joost VandeVondele
parent 15ac117ac4
commit 02ef1f4496
2 changed files with 14 additions and 3 deletions
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src/position.cpp
+4 -1
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@@ -1054,7 +1054,10 @@ Key Position::key_after(Move m) const {
if (captured)
k ^= Zobrist::psq[captured][to];
return k ^ Zobrist::psq[pc][to] ^ Zobrist::psq[pc][from];
k ^= Zobrist::psq[pc][to] ^ Zobrist::psq[pc][from];
return (captured || type_of(pc) == PAWN)
? k : adjust_key50<true>(k);
}