From 4fcd78ceb4a5cf25ee652ee7793bb0a3fa1f95df Mon Sep 17 00:00:00 2001
From: Shawn Xu <xu107288696@gmail.com>
Date: Mon, 18 Nov 2024 09:08:26 -0800
Subject: [PATCH] Simplify Probcut Bonus

Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 172288 W: 44656 L: 44580 D: 83052
Ptnml(0-2): 507, 20650, 43782, 20670, 535
https://tests.stockfishchess.org/tests/view/673b74f986d5ee47d953f1a3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94596 W: 24098 L: 23953 D: 46545
Ptnml(0-2): 57, 10322, 26393, 10471, 55
https://tests.stockfishchess.org/tests/view/673d191886d5ee47d953f337

closes https://github.com/official-stockfish/Stockfish/pull/5688

Bench: 1031022
---
 src/search.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/search.cpp b/src/search.cpp
index 213bbdab..ace6385d 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -910,8 +910,7 @@ Value Search::Worker::search(
 
             if (value >= probCutBeta)
             {
-                thisThread->captureHistory[movedPiece][move.to_sq()][type_of(captured)]
-                  << stat_bonus(depth - 2);
+                thisThread->captureHistory[movedPiece][move.to_sq()][type_of(captured)] << 1300;
 
                 // Save ProbCut data into transposition table
                 ttWriter.write(posKey, value_to_tt(value, ss->ply), ss->ttPv, BOUND_LOWER,