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On step 18 increase reduction by 2 if not ttmove and cutnode

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stc: https://tests.stockfishchess.org/tests/view/63babc9fcd3db0c8d399f723
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 43104 W: 11711 L: 11389 D: 20004
Ptnml(0-2): 211, 4518, 11793, 4798, 232

ltc: https://tests.stockfishchess.org/tests/view/63bb1857cd3db0c8d39a0661
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 127104 W: 33810 L: 33339 D: 59955
Ptnml(0-2): 39, 12155, 38702, 12608, 48

closes https://github.com/official-stockfish/Stockfish/pull/4334

Bench: 4035725
This commit is contained in:
candirufish 2023-01-09 14:26:51 +01:00 • committed by Joost VandeVondele
parent ea0f34120f
commit 4101893a28
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1215,6 +1215,10 @@ moves_loop: // When in check, search starts here
// Step 18. Full depth search when LMR is skipped. If expected reduction is high, reduce its depth by 1. // Step 18. Full depth search when LMR is skipped. If expected reduction is high, reduce its depth by 1.
else if (!PvNode || moveCount > 1) else if (!PvNode || moveCount > 1)
{ {
// Increase reduction for cut nodes and not ttMove (~1 Elo)
if (!ttMove && cutNode)
r += 2;
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth - (r > 4), !cutNode); value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth - (r > 4), !cutNode);
} }