From 5ce7f866a57264c38cf308152208deadc65508c8 Mon Sep 17 00:00:00 2001
From: Shawn Xu <xu107288696@gmail.com>
Date: Sat, 7 Sep 2024 15:04:28 -0700
Subject: [PATCH] Simplify Fail Low Bonus

Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 302528 W: 78190 L: 78264 D: 146074
Ptnml(0-2): 1029, 35797, 77551, 35993, 894
https://tests.stockfishchess.org/tests/view/66dcebdedc53972b68218c7e

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 122754 W: 31025 L: 30907 D: 60822
Ptnml(0-2): 74, 13597, 33908, 13733, 65
https://tests.stockfishchess.org/tests/view/66e0c38686d5ee47d953a481

closes https://github.com/official-stockfish/Stockfish/pull/5594

Bench: 1646373
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 4f6e7511..135db0ce 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1365,7 +1365,7 @@ moves_loop:  // When in check, search starts here
     }
 
     // Bonus when search fails low and there is a TT move
-    else if (moveCount > 1 && ttData.move && !allNode)
+    else if (ttData.move && !allNode)
         thisThread->mainHistory[us][ttData.move.from_to()] << stat_bonus(depth) / 4;
 
     if (PvNode)