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Remove non-pawn material check in qsearch pruning

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Passed simplification STC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 47712 W: 12621 L: 12409 D: 22682
Ptnml(0-2): 224, 5349, 12480, 5597, 206
https://tests.stockfishchess.org/tests/view/67a1b4fb612069de394afc37

Passed rebased simplification LTC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 188274 W: 47727 L: 47677 D: 92870
Ptnml(0-2): 171, 20429, 52867, 20519, 151
https://tests.stockfishchess.org/tests/view/67a2a761fedef70e42ac3300

closes https://github.com/official-stockfish/Stockfish/pull/5866

bench 2654242
This commit is contained in:
Daniel Monroe
2025-02-04 15:48:40 -08:00
committed by Joost VandeVondele
parent 4c6d2bf921
commit 3dfbc5de25
1 changed files with 1 additions and 2 deletions
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src/search.cpp
+1 -2
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@@ -1490,7 +1490,6 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
Value bestValue, value, futilityBase; Value bestValue, value, futilityBase;
bool pvHit, givesCheck, capture; bool pvHit, givesCheck, capture;
int moveCount; int moveCount;
Color us = pos.side_to_move();
// Step 1. Initialize node // Step 1. Initialize node
if (PvNode) if (PvNode)
@@ -1603,7 +1602,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
moveCount++; moveCount++;
// Step 6. Pruning // Step 6. Pruning
if (!is_loss(bestValue) && pos.non_pawn_material(us)) if (!is_loss(bestValue))
{ {
// Futility pruning and moveCount pruning // Futility pruning and moveCount pruning
if (!givesCheck && move.to_sq() != prevSq && !is_loss(futilityBase) if (!givesCheck && move.to_sq() != prevSq && !is_loss(futilityBase)