From a4edacb87aeba72483e1524ade5bf79129c88513 Mon Sep 17 00:00:00 2001
From: Nonlinear2 <131959792+Nonlinear2@users.noreply.github.com>
Date: Wed, 12 Feb 2025 00:15:32 +0100
Subject: [PATCH] Tweak the cutnode depth condition for TT cutoffs

Passed STC:
https://tests.stockfishchess.org/tests/view/67ab396ab5c93ee812d851f3
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 83648 W: 21964 L: 21571 D: 40113
Ptnml(0-2): 339, 9779, 21217, 10128, 361

Passed LTC:
https://tests.stockfishchess.org/tests/view/67ab9647133d55b1d3bc171e
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 68160 W: 17551 L: 17166 D: 33443
Ptnml(0-2): 62, 7353, 18870, 7728, 67

closes https://github.com/official-stockfish/Stockfish/pull/5876

Bench: 3087275
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 4bc6109e..02323d1e 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -672,7 +672,7 @@ Value Search::Worker::search(
     if (!PvNode && !excludedMove && ttData.depth > depth - (ttData.value <= beta)
         && is_valid(ttData.value)  // Can happen when !ttHit or when access race in probe()
         && (ttData.bound & (ttData.value >= beta ? BOUND_LOWER : BOUND_UPPER))
-        && (cutNode == (ttData.value >= beta) || depth > 9))
+        && (cutNode == (ttData.value >= beta) || (depth > 9 || (rootDepth > 10 && depth > 5))))
     {
         // If ttMove is quiet, update move sorting heuristics on TT hit
         if (ttData.move && ttData.value >= beta)