From 1f9af9966fd5be2aefd33ab99d1cb07b8415c3d1 Mon Sep 17 00:00:00 2001
From: Daniel Monroe <github.com@danielmonroe.net>
Date: Thu, 8 May 2025 12:10:51 -0700
Subject: [PATCH] Simplify futility pruning term

Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 49920 W: 12933 L: 12727 D: 24260
Ptnml(0-2): 141, 5865, 12752, 6051, 151
https://tests.stockfishchess.org/tests/view/681d01d33629b02d74b1756e

Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 68808 W: 17573 L: 17402 D: 33833
Ptnml(0-2): 23, 7343, 19511, 7494, 33
https://tests.stockfishchess.org/tests/view/681e33843629b02d74b176b1

closes https://github.com/official-stockfish/Stockfish/pull/6058

Bench: 2041086
---
 src/search.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index 45515555e..7c83cae24 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1077,9 +1077,8 @@ moves_loop:  // When in check, search starts here
 
                 lmrDepth += history / 3388;
 
-                Value futilityValue =
-                  ss->staticEval + (bestMove ? 46 : 138) + 117 * lmrDepth
-                  + 102 * (bestValue < ss->staticEval - 127 && ss->staticEval > alpha - 50);
+                Value futilityValue = ss->staticEval + (bestMove ? 46 : 138) + 117 * lmrDepth
+                                    + 102 * (ss->staticEval > alpha);
 
                 // Futility pruning: parent node
                 // (*Scaler): Generally, more frequent futility pruning