From: Unai Corzo <corzounai@gmail.com>
Date: Thu, 3 Sep 2020 10:18:42 +0000 (+0200)
Subject: Simplify singularQuietLMR
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=d6530f7d49ef45e38dacafd8a3a838130113265c

Simplify singularQuietLMR

remove formerPV dependence

STC https://tests.stockfishchess.org/tests/view/5f4cb922ba100690c5cc5d35
LLR: 2.96 (-2.94,2.94) {-1.25,0.25}
Total: 113672 W: 12347 L: 12368 D: 88957
Ptnml(0-2): 566, 9537, 36699, 9420, 614

LTC https://tests.stockfishchess.org/tests/view/5f4e8474ba100690c5cc5e12
LLR: 2.93 (-2.94,2.94) {-0.75,0.25}
Total: 43032 W: 2298 L: 2227 D: 38507
Ptnml(0-2): 45, 1940, 17475, 2011, 45

closes https://github.com/official-stockfish/Stockfish/pull/3102

bench: 3290084
---

diff --git a/src/search.cpp b/src/search.cpp
index 0d823c8e..b5e190c8 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1196,7 +1196,7 @@ moves_loop: // When in check, search starts from here
 
           // Decrease reduction if ttMove has been singularly extended (~3 Elo)
           if (singularQuietLMR)
-              r -= 1 + formerPv;
+              r--;
 
           if (!captureOrPromotion)
           {