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Adjust best value after a pruned quiet move

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Logic somewhat similar to how we adjust best value after pruned captures
in qsearch, but in search this patch does it after pruned quiet moves
and also to not full scale of futility value but to smth in between
best value and futility value.

Passed STC:
https://tests.stockfishchess.org/tests/view/6601cf900ec64f0526c55c30
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 59936 W: 15722 L: 15369 D: 28845
Ptnml(0-2): 182, 7097, 15112, 7340, 237

Passed LTC:
https://tests.stockfishchess.org/tests/view/66029b2d0ec64f0526c566f1
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 118362 W: 29953 L: 29460 D: 58949
Ptnml(0-2): 68, 13159, 32249, 13622, 83

closes https://github.com/official-stockfish/Stockfish/pull/5141

bench 1772608
This commit is contained in:
Michael Chaly 2024-03-29 00:17:37 +03:00 • committed by Joost VandeVondele
parent e636f73ab8
commit 0ef5d05102
1 changed files with 9 additions and 4 deletions
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13
src/search.cpp
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@ -995,12 +995,17 @@ moves_loop: // When in check, search starts here
lmrDepth += history / 5637;
Value futilityValue =
ss->staticEval + (bestValue < ss->staticEval - 59 ? 141 : 58) + 125 * lmrDepth;
// Futility pruning: parent node (~13 Elo)
if (!ss->inCheck && lmrDepth < 15
&& ss->staticEval + (bestValue < ss->staticEval - 59 ? 141 : 58)
+ 125 * lmrDepth
<= alpha)
if (!ss->inCheck && lmrDepth < 15 && futilityValue <= alpha)
{
if (bestValue <= futilityValue && abs(bestValue) < VALUE_TB_WIN_IN_MAX_PLY
&& futilityValue < VALUE_TB_WIN_IN_MAX_PLY)
bestValue = (bestValue + futilityValue * 3) / 4;
continue;
}
lmrDepth = std::max(lmrDepth, 0);