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Replacing the futility margin static value with a continuous transition

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Smooth the futility margin by interpolating the multiplier based on depth, replacing the previous static value with a continuous transition between depth 1 and 10.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 208448 W: 53891 L: 53324 D: 101233
Ptnml(0-2): 629, 24426, 53574, 24939, 656
https://tests.stockfishchess.org/tests/view/69e232206f344a19176002f3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 208938 W: 53432 L: 52765 D: 102741
Ptnml(0-2): 105, 22531, 58550, 23158, 125
https://tests.stockfishchess.org/tests/view/69e8b5d00e9667dd5a7656c6

closes https://github.com/official-stockfish/Stockfish/pull/6780

Bench: 2661424
This commit is contained in:
FauziAkram
2026-05-04 08:30:28 +02:00
committed by Joost VandeVondele
parent 04ce2c04d7
commit 7bd32a51f5
1 changed files with 3 additions and 1 deletions
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src/search.cpp
+3 -1
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@@ -916,7 +916,9 @@ Value Search::Worker::search(
if (!ss->ttPv && depth < 15 && eval >= beta && (!ttData.move || ttCapture) && !is_loss(beta)
&& !is_win(eval))
{
Value futilityMult = 76 - 21 * !ss->ttHit;
Value futilityMult = interpolate(std::min(int(depth), 10), 1, 10, 40, 76);
futilityMult -= 21 * !ss->ttHit;
Value futilityMargin = futilityMult * depth
- (2686 * improving + 362 * opponentWorsening) * futilityMult / 1024
+ std::abs(correctionValue) / 180600;