From 43d8ccf85641addd49a5c7e295919fa16c88b72c Mon Sep 17 00:00:00 2001
From: Nonlinear2 <131959792+Nonlinear2@users.noreply.github.com>
Date: Sun, 16 Mar 2025 13:02:16 +0100
Subject: [PATCH] change the bonusScale depth component

Passed STC:
https://tests.stockfishchess.org/tests/view/67d35f66517865b4a2dfc801
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 110816 W: 28875 L: 28449 D: 53492
Ptnml(0-2): 329, 13064, 28231, 13420, 364

Passed LTC:
https://tests.stockfishchess.org/tests/view/67d4bdf0517865b4a2dfd131
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 121824 W: 31047 L: 30559 D: 60218
Ptnml(0-2): 52, 13056, 34214, 13532, 58

closes https://github.com/official-stockfish/Stockfish/pull/5932

Bench: 2128807
---
 src/search.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 4b6ad52e4..a91fb3c1b 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1445,7 +1445,8 @@ moves_loop:  // When in check, search starts here
     // Bonus for prior quiet countermove that caused the fail low
     else if (!priorCapture && prevSq != SQ_NONE)
     {
-        int bonusScale = (112 * (depth > 5) + 34 * !allNode + 164 * ((ss - 1)->moveCount > 8)
+        int bonusScale = (std::clamp(160 * (depth - 4) / 2, 0, 200) + 34 * !allNode
+                          + 164 * ((ss - 1)->moveCount > 8)
                           + 141 * (!ss->inCheck && bestValue <= ss->staticEval - 100)
                           + 121 * (!(ss - 1)->inCheck && bestValue <= -(ss - 1)->staticEval - 75)
                           + 86 * ((ss - 1)->isTTMove) + 86 * (ss->cutoffCnt <= 3)