From 40ef7b1212c5a055c20a9c184f0bdf999c33c944 Mon Sep 17 00:00:00 2001
From: FauziAkram <fauzi.dabat@hotmail.com>
Date: Thu, 8 May 2025 19:43:55 +0300
Subject: [PATCH] Simplify probcut

Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 80800 W: 20947 L: 20774 D: 39079
Ptnml(0-2): 217, 9446, 20906, 9609, 222
https://tests.stockfishchess.org/tests/view/680e83163629b02d74b15e2a

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 359004 W: 91362 L: 91486 D: 176156
Ptnml(0-2): 177, 39133, 101007, 39007, 178
https://tests.stockfishchess.org/tests/view/680e95db3629b02d74b15e7a

closes https://github.com/official-stockfish/Stockfish/pull/6054

Bench: 2060860
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 2cab7bd9d..45515555e 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -952,7 +952,7 @@ Value Search::Worker::search(
 moves_loop:  // When in check, search starts here
 
     // Step 12. A small Probcut idea
-    probCutBeta = beta + 180 + depth * 20;
+    probCutBeta = beta + 400;
     if ((ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 4 && ttData.value >= probCutBeta
         && !is_decisive(beta) && is_valid(ttData.value) && !is_decisive(ttData.value))
         return probCutBeta;