From bc9f08731f10896a306bcc34e30e5606087af79a Mon Sep 17 00:00:00 2001
From: FauziAkram <fauzi.dabat@hotmail.com>
Date: Sat, 1 Nov 2025 03:36:04 +0300
Subject: [PATCH] Simplify Futility pruning formula

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 170112 W: 44266 L: 44193 D: 81653
Ptnml(0-2): 599, 20062, 43611, 20235, 549
https://tests.stockfishchess.org/tests/view/68f50b94637acd2a11e721ad

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 164658 W: 42393 L: 42318 D: 79947
Ptnml(0-2): 120, 18127, 45747, 18228, 107
https://tests.stockfishchess.org/tests/view/68fa6683637acd2a11e72ac3

closes https://github.com/official-stockfish/Stockfish/pull/6389

bench: 2351426
---
 src/search.cpp | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 212e14fcf..a0c6eafe3 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -847,7 +847,6 @@ Value Search::Worker::search(
             return futilityMult * d                                //
                  - 2094 * improving * futilityMult / 1024          //
                  - 1324 * opponentWorsening * futilityMult / 4096  //
-                 + (ss - 1)->statScore / 331                       //
                  + std::abs(correctionValue) / 158105;
         };