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Simplify Zobrist keys for captures

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The Zobrist keys for NO_PIECE are 0 so no need to special case captures.
Also the TranspositionTable reference passed to do_null_move() can be
const.

STC Simplification:
https://tests.stockfishchess.org/tests/view/6764a79a86d5ee47d9544005
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 114240 W: 29654 L: 29523 D: 55063
Ptnml(0-2): 329, 12360, 31620, 12473, 338

closes https://github.com/official-stockfish/Stockfish/pull/5731

No functional change
This commit is contained in:
mstembera
2024-12-22 15:29:42 +01:00
committed by Disservin
parent 79261bec59
commit f656fdfa9a
2 changed files with 3 additions and 6 deletions
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src/position.h
+1 -1
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@@ -143,7 +143,7 @@ class Position {
void do_move(Move m, StateInfo& newSt);
void do_move(Move m, StateInfo& newSt, bool givesCheck);
void undo_move(Move m);
void do_null_move(StateInfo& newSt, TranspositionTable& tt);
void do_null_move(StateInfo& newSt, const TranspositionTable& tt);
void undo_null_move();
// Static Exchange Evaluation