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Simplify collection of bad moves for history updates.

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1. collect only the first 32 moves searched and ignore the rest. So late bad moves get no further negative history updates.
2. collect now for quiet moves also at most 32 bad moves

STC:
https://tests.stockfishchess.org/tests/view/6517b3aeb3e74811c8af5651
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 51168 W: 13013 L: 12810 D: 25345
Ptnml(0-2): 120, 6006, 13186, 6095, 177

LTC:
https://tests.stockfishchess.org/tests/view/651adafecff46e538ee02734
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 109866 W: 27786 L: 27656 D: 54424
Ptnml(0-2): 52, 11816, 31069, 11942, 54

closes https://github.com/official-stockfish/Stockfish/pull/4818

Bench: 1338617
This commit is contained in:
Stefan Geschwentner 2023-09-30 06:57:39 +02:00 • committed by Joost VandeVondele
parent c17a657b04
commit 008d59512a
1 changed files with 4 additions and 4 deletions
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8
src/search.cpp
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@ -546,7 +546,7 @@ namespace {
assert(0 < depth && depth < MAX_PLY); assert(0 < depth && depth < MAX_PLY);
assert(!(PvNode && cutNode)); assert(!(PvNode && cutNode));
Move pv[MAX_PLY+1], capturesSearched[32], quietsSearched[64]; Move pv[MAX_PLY+1], capturesSearched[32], quietsSearched[32];
StateInfo st; StateInfo st;
ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize); ASSERT_ALIGNED(&st, Eval::NNUE::CacheLineSize);
@ -1328,12 +1328,12 @@ moves_loop: // When in check, search starts here
// If the move is worse than some previously searched move, remember it, to update its stats later // If the move is worse than some previously searched move, remember it, to update its stats later
if (move != bestMove) if (move != bestMove && moveCount <= 32)
{ {
if (capture && captureCount < 32) if (capture)
capturesSearched[captureCount++] = move; capturesSearched[captureCount++] = move;
else if (!capture && quietCount < 64) else
quietsSearched[quietCount++] = move; quietsSearched[quietCount++] = move;
} }
} }