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Simplify futility multiplier

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this patch simplifies the Value futility multiplier and changes pruning behaviour

passed stc: https://tests.stockfishchess.org/tests/view/6a462265f97ff95f78795600
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 38112 W: 10071 L: 9758 D: 18283
Ptnml(0-2): 88, 4341, 9903, 4618, 106

passed ltc: https://tests.stockfishchess.org/tests/view/6a470bc5f97ff95f7879576a
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 67482 W: 17738 L: 17363 D: 32381
Ptnml(0-2): 36, 7061, 19164, 7452, 28

patch rebased to latest master

closes https://github.com/official-stockfish/Stockfish/pull/6946

Bench: 2353997
This commit is contained in:
Adrian Ladoni
2026-07-06 11:33:03 +02:00
committed by Joost VandeVondele
parent bc079c46a9
commit 7da31a1f1d
1 changed files with 1 additions and 1 deletions
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src/search.cpp
+1 -1
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@@ -976,7 +976,7 @@ Value Search::Worker::search(
if (!ss->ttPv && depth < 17 && eval >= beta && (!ttData.move || ttCapture) && !is_loss(beta) if (!ss->ttPv && depth < 17 && eval >= beta && (!ttData.move || ttCapture) && !is_loss(beta)
&& !is_win(eval)) && !is_win(eval))
{ {
Value futilityMult = interpolate(std::min(int(depth), 10), 1, 10, 40, 80); Value futilityMult = std::min(40 + depth * 4, 80);
futilityMult -= 20 * !ss->ttHit; futilityMult -= 20 * !ss->ttHit;
Value futilityMargin = futilityMult * depth Value futilityMargin = futilityMult * depth