From 2d3ef434b4009fcc9e198b508f00957c2d05eb1e Mon Sep 17 00:00:00 2001
From: Shawn Xu <xu107288696@gmail.com>
Date: Sat, 6 Jul 2024 03:44:28 -0700
Subject: [PATCH] Tweak LMR at Root

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 328192 W: 84751 L: 84014 D: 159427
Ptnml(0-2): 758, 38802, 84253, 39511, 772
https://tests.stockfishchess.org/tests/view/6689203959cb3228a4759a49

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 56748 W: 14494 L: 14136 D: 28118
Ptnml(0-2): 19, 6089, 15803, 6441, 22
https://tests.stockfishchess.org/tests/view/66892d76e59d990b103f6626

closes https://github.com/official-stockfish/Stockfish/pull/5452

Bench 1253593
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 1bce9daa..9d0b5627 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1185,7 +1185,7 @@ moves_loop:  // When in check, search starts here
         r -= ss->statScore / 10898;
 
         // Step 17. Late moves reduction / extension (LMR, ~117 Elo)
-        if (depth >= 2 && moveCount > 1 + rootNode)
+        if (depth >= 2 && moveCount > 1 + (rootNode && depth < 10))
         {
             // In general we want to cap the LMR depth search at newDepth, but when
             // reduction is negative, we allow this move a limited search extension