jirayu_sri/stockfish
1
0
Fork 0
mirror of https://github.com/official-stockfish/Stockfish.git synced 2026-07-22 12:47:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

Restructure Futility pruning

Browse Source 
to a simpler and cleaner version

Passed non-reg test:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 175648 W: 45156 L: 45091 D: 85401
Ptnml(0-2): 459, 19228, 48383, 19297, 457
https://tests.stockfishchess.org/tests/view/69d8d9263ca80bdf151d454a

closes https://github.com/official-stockfish/Stockfish/pull/6733

No functional change
This commit is contained in:
FauziAkram
2026-04-19 07:21:27 +02:00
committed by Joost VandeVondele
parent 40ac93b8f8
commit c66acdac99
1 changed files with 7 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+7 -9
View File
@@ -894,17 +894,15 @@ Value Search::Worker::search(
// Step 8. Futility pruning: child node
// The depth condition is important for mate finding.
if (!ss->ttPv && depth < 15 && eval >= beta && (!ttData.move || ttCapture) && !is_loss(beta)
&& !is_win(eval))
{
auto futility_margin = [&](Depth d) {
Value futilityMult = 76 - 21 * !ss->ttHit;
Value futilityMult = 76 - 21 * !ss->ttHit;
Value futilityMargin = futilityMult * depth
- (2686 * improving + 362 * opponentWorsening) * futilityMult / 1024
+ std::abs(correctionValue) / 180600;
return futilityMult * d
- (2686 * improving + 362 * opponentWorsening) * futilityMult / 1024 //
+ std::abs(correctionValue) / 180600;
};
if (!ss->ttPv && depth < 15 && eval - futility_margin(depth) >= beta && eval >= beta
&& (!ttData.move || ttCapture) && !is_loss(beta) && !is_win(eval))
if (eval - futilityMargin >= beta)
return (2 * beta + eval) / 3;
}