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Simplify stand pat adjustement

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Remove && !PvNode condition for stand pat adjustement in quiescence search.

Passed non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 108544 W: 28228 L: 28085 D: 52231
Ptnml(0-2): 389, 12902, 27554, 13031, 396
https://tests.stockfishchess.org/tests/view/66bb402e4ff211be9d4ee688

Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 193014 W: 48796 L: 48751 D: 95467
Ptnml(0-2): 188, 21481, 53116, 21542, 180
https://tests.stockfishchess.org/tests/view/66bc78774ff211be9d4ee88f

closes https://github.com/official-stockfish/Stockfish/pull/5538

Bench 1787360
This commit is contained in:
Nonlinear2 2024-08-16 22:54:05 +02:00 • committed by Joost VandeVondele
parent 87814d2fb8
commit 6cf7f300ac
2 changed files with 2 additions and 1 deletions
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1
AUTHORS
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@ -171,6 +171,7 @@ Niklas Fiekas (niklasf)
Nikolay Kostov (NikolayIT)
Norman Schmidt (FireFather)
notruck
Nour Berakdar (Nonlinear)
Ofek Shochat (OfekShochat, ghostway)
Ondrej Mosnáček (WOnder93)
Ondřej Mišina (AndrovT)

2
src/search.cpp
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@ -1502,7 +1502,7 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
// Stand pat. Return immediately if static value is at least beta
if (bestValue >= beta)
{
if (std::abs(bestValue) < VALUE_TB_WIN_IN_MAX_PLY && !PvNode)
if (std::abs(bestValue) < VALUE_TB_WIN_IN_MAX_PLY)
bestValue = (3 * bestValue + beta) / 4;
if (!ss->ttHit)
ttWriter.write(posKey, value_to_tt(bestValue, ss->ply), false, BOUND_LOWER,