From: candirufish <38038147+candirufish@users.noreply.github.com>
Date: Tue, 31 May 2022 19:52:04 +0000 (+0200)
Subject: cutnode and movecount lmr extension simplification
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=653bd0817ceea2980474d76198fe527f8b84bf04;p=stockfish

cutnode and movecount lmr extension simplification

Passed STC
https://tests.stockfishchess.org/tests/view/6294133cb0d5a7d1b780ece3
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 41072 W: 11052 L: 10908 D: 19112
Ptnml(0-2): 153, 4324, 11461, 4422, 176

Passed LTC
ltc: https://tests.stockfishchess.org/tests/view/62947ae6b0d5a7d1b780fe86
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 102736 W: 27509 L: 27459 D: 47768
Ptnml(0-2): 98, 9734, 31669, 9754, 113

closes https://github.com/official-stockfish/Stockfish/pull/4045

Bench: 6410652
---

diff --git a/src/search.cpp b/src/search.cpp
index 407cb701..8ecdbc30 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1194,8 +1194,7 @@ moves_loop: // When in check, search starts here
           // deeper than the first move (this may lead to hidden double extensions).
           int deeper =   r >= -1                   ? 0
                        : moveCount <= 4            ? 2
-                       : PvNode                    ? 1
-                       : cutNode && moveCount <= 8 ? 1
+                       : PvNode || cutNode         ? 1
                        :                             0;
 
           Depth d = std::clamp(newDepth - r, 1, newDepth + deeper);