From: Dubslow <bunslow@gmail.com>
Date: Mon, 30 May 2022 00:52:11 +0000 (-0500)
Subject: Remove LMR condition for complex pos
X-Git-Url: https://git.sesse.net/?a=commitdiff_plain;h=90cf8e7d2bde9e480aac4b119ce130e09dd2be39;p=stockfish

Remove LMR condition for complex pos

Inspired by Kia's similar test: https://tests.stockfishchess.org/tests/view/6292898c1e7cd5f29966fbe0

Passed STC:
https://tests.stockfishchess.org/tests/view/62941588b0d5a7d1b780ed4b
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 266872 W: 70850 L: 71033 D: 124989
Ptnml(0-2): 1180, 30114, 70941, 30111, 1090

Passed LTC:
https://tests.stockfishchess.org/tests/view/62964a754628d33daa24f062
LLR: 2.95 (-2.94,2.94) <-2.25,0.25>
Total: 70160 W: 18756 L: 18662 D: 32742
Ptnml(0-2): 42, 6976, 20950, 7070, 42

closes https://github.com/official-stockfish/Stockfish/pull/4047

Bench 6237567
---

diff --git a/src/search.cpp b/src/search.cpp
index 8ecdbc30..ea1e63fe 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1167,11 +1167,6 @@ moves_loop: // When in check, search starts here
           if (ttCapture)
               r++;
 
-          // Decrease reduction at PvNodes if bestvalue
-          // is vastly different from static evaluation
-          if (PvNode && !ss->inCheck && abs(ss->staticEval - bestValue) > 250)
-              r--;
-
           // Decrease reduction for PvNodes based on depth
           if (PvNode)
               r -= 1 + 15 / ( 3 + depth );