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Simplify Futility Margin

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Passed STC Non-regression:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 159008 W: 41500 L: 41414 D: 76094
Ptnml(0-2): 501, 18821, 40759, 18937, 486
https://tests.stockfishchess.org/tests/view/680ff9e23629b02d74b1663a

Passed LTC Non-regression:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 163572 W: 41617 L: 41543 D: 80412
Ptnml(0-2): 90, 17755, 46024, 17825, 92
https://tests.stockfishchess.org/tests/view/6814dd973629b02d74b16bac

closes https://github.com/official-stockfish/Stockfish/pull/6065

Bench: 2018775
This commit is contained in:
Shawn Xu
2025-04-28 14:55:56 -07:00
committed by Joost VandeVondele
parent e4b0f37493
commit 6f445631ab
1 changed files with 8 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/search.cpp
View File

@@ -825,19 +825,17 @@ Value Search::Worker::search(
// The depth condition is important for mate finding.
{
auto futility_margin = [&](Depth d) {
Value futilityMult = 105 - 23 * (cutNode && !ss->ttHit);
Value improvingDeduction = improving * futilityMult * 2;
Value worseningDeduction = opponentWorsening * futilityMult / 3;
Value futilityMult = 93 - 20 * (cutNode && !ss->ttHit);
return futilityMult * d //
- improvingDeduction //
- worseningDeduction //
+ (ss - 1)->statScore / 335 //
+ std::abs(correctionValue) / 149902;
return futilityMult * d //
- improving * futilityMult * 2 //
- opponentWorsening * futilityMult / 3 //
+ (ss - 1)->statScore / 376 //
+ std::abs(correctionValue) / 168639;
};
if (!ss->ttPv && depth < 14 && eval + (eval - beta) / 8 - futility_margin(depth) >= beta
&& eval >= beta && (!ttData.move || ttCapture) && !is_loss(beta) && !is_win(eval))
if (!ss->ttPv && depth < 14 && eval - futility_margin(depth) >= beta && eval >= beta
&& (!ttData.move || ttCapture) && !is_loss(beta) && !is_win(eval))
return beta + (eval - beta) / 3;
}