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Adjust singular LMR for positions seen in PV

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This patch continues work on altering search for ttPv nodes, using recent idea to alter it more in not PvNodes. Previous tweak based on this idea adjusted singularBeta - this one adjusts value of singularLMR, so they are both related to singular extension search.

passed STC
http://tests.stockfishchess.org/tests/view/5e700737e42a5c3b3ca2e659
LLR: 2.95 (-2.94,2.94) {-0.50,1.50}
Total: 140608 W: 27053 L: 26659 D: 86896
Ptnml(0-2): 2425, 16337, 32439, 16625, 2478

passed LTC
http://tests.stockfishchess.org/tests/view/5e7068eae42a5c3b3ca2e687
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 79318 W: 10463 L: 10064 D: 58791
Ptnml(0-2): 567, 7416, 23359, 7685, 632

closes https://github.com/official-stockfish/Stockfish/pull/2588

Bench: 4952322
This commit is contained in:
Vizvezdenec 2020-03-17 19:38:21 +03:00 • committed by Joost VandeVondele
parent 07caca2587
commit ff27109313
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1149,7 +1149,7 @@ moves_loop: // When in check, search starts from here
// Decrease reduction if ttMove has been singularly extended (~3 Elo)
if (singularLMR)
r -= 2;
r -= 1 + (ttPv && !PvNode);
if (!captureOrPromotion)
{