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Don't increase rule50 when doing null moves

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also prefetch a bit earlier while we're at it

passed STC: https://tests.stockfishchess.org/tests/view/678c0860f4dc0a8b4ae8cf58
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 67328 W: 17608 L: 17418 D: 32302
Ptnml(0-2): 256, 7905, 17156, 8087, 260

passed LTC: https://tests.stockfishchess.org/tests/view/678c1a56f4dc0a8b4ae8cfb1
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 340896 W: 86577 L: 86685 D: 167634
Ptnml(0-2): 291, 38325, 93332, 38201, 299

closes https://github.com/official-stockfish/Stockfish/pull/5831

Bench: 1910281
This commit is contained in:
Carlos Esparza
2025-01-18 20:58:14 +01:00
committed by Disservin
parent 4a77fb213f
commit 7684b6e4d8
1 changed files with 5 additions and 6 deletions
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11
src/position.cpp
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@@ -1023,11 +1023,6 @@ void Position::do_null_move(StateInfo& newSt, const TranspositionTable& tt) {
st->next = &newSt;
st = &newSt;
st->dirtyPiece.dirty_num = 0;
st->dirtyPiece.piece[0] = NO_PIECE; // Avoid checks in UpdateAccumulator()
st->accumulatorBig.computed[WHITE] = st->accumulatorBig.computed[BLACK] =
st->accumulatorSmall.computed[WHITE] = st->accumulatorSmall.computed[BLACK] = false;
if (st->epSquare != SQ_NONE)
{
st->key ^= Zobrist::enpassant[file_of(st->epSquare)];
@@ -1035,9 +1030,13 @@ void Position::do_null_move(StateInfo& newSt, const TranspositionTable& tt) {
}
st->key ^= Zobrist::side;
++st->rule50;
prefetch(tt.first_entry(key()));
st->dirtyPiece.dirty_num = 0;
st->dirtyPiece.piece[0] = NO_PIECE; // Avoid checks in UpdateAccumulator()
st->accumulatorBig.computed[WHITE] = st->accumulatorBig.computed[BLACK] =
st->accumulatorSmall.computed[WHITE] = st->accumulatorSmall.computed[BLACK] = false;
st->pliesFromNull = 0;
sideToMove = ~sideToMove;