From f98c178960a26e80bd7ffc9a0a280610fdaf92fd Mon Sep 17 00:00:00 2001
From: FauziAkram <fauzi.dabat@hotmail.com>
Date: Sun, 27 Apr 2025 14:42:35 +0300
Subject: [PATCH] Improve quiet moves bonus

Inspired by an old test by Peregrine.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 453024 W: 117244 L: 116316 D: 219464
Ptnml(0-2): 1336, 53355, 116258, 54171, 1392
https://tests.stockfishchess.org/tests/view/680ccacc3629b02d74b15532

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 140550 W: 35990 L: 35462 D: 69098
Ptnml(0-2): 65, 15152, 39319, 15668, 71
https://tests.stockfishchess.org/tests/view/680d2ed73629b02d74b15691

closes https://github.com/official-stockfish/Stockfish/pull/6028

Bench: 1708152
---
 src/search.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index e9dfb7172..fab0fd617 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -839,7 +839,8 @@ Value Search::Worker::search(
     }
 
     // Use static evaluation difference to improve quiet move ordering
-    if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture)
+    if (((ss - 1)->currentMove).is_ok() && !(ss - 1)->inCheck && !priorCapture
+        && (ttData.depth - 2) <= depth)
     {
         int bonus = std::clamp(-10 * int((ss - 1)->staticEval + ss->staticEval), -1950, 1416) + 655;
         thisThread->mainHistory[~us][((ss - 1)->currentMove).from_to()] << bonus * 1124 / 1024;