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Skip moves-loop pruning in qsearch if we have only pawns

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At first my idea was only to cover movecount and futility pruning, but
@peregrineshahin suggested to test it on all moves-loop pruning and it worked.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 167968 W: 42970 L: 42480 D: 82518
Ptnml(0-2): 444, 18324, 46002, 18726, 488
https://tests.stockfishchess.org/tests/view/6511181a55b420c569d0d54c

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 40794 W: 10496 L: 10182 D: 20116
Ptnml(0-2): 12, 4021, 12025, 4319, 20
https://tests.stockfishchess.org/tests/view/6512ccc4b3e74811c8aee86c

closes https://github.com/official-stockfish/Stockfish/pull/4809

Bench: 1338472
This commit is contained in:
cj5716 2023-09-25 13:18:05 +08:00 • committed by Disservin
parent 4f0fecad8a
commit 660da1ca7b
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -1427,6 +1427,7 @@ moves_loop: // When in check, search starts here
Value bestValue, value, ttValue, futilityValue, futilityBase;
bool pvHit, givesCheck, capture;
int moveCount;
Color us = pos.side_to_move();
// Step 1. Initialize node
if (PvNode)
@ -1537,7 +1538,7 @@ moves_loop: // When in check, search starts here
moveCount++;
// Step 6. Pruning.
if (bestValue > VALUE_TB_LOSS_IN_MAX_PLY)
if (bestValue > VALUE_TB_LOSS_IN_MAX_PLY && pos.non_pawn_material(us))
{
// Futility pruning and moveCount pruning (~10 Elo)
if ( !givesCheck