From 3a0418c0d0353ad5720e1fea83510cbee5608485 Mon Sep 17 00:00:00 2001
From: Daniel Monroe <github.com@danielmonroe.net>
Date: Tue, 4 Feb 2025 15:16:28 -0800
Subject: [PATCH] Simplify opponent worsening

Passed simplification STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 57120 W: 14712 L: 14526 D: 27882
Ptnml(0-2): 53, 6241, 15796, 6407, 63
https://tests.stockfishchess.org/tests/view/67a26153eb183d11c659454d

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 313452 W: 79893 L: 79973 D: 153586
Ptnml(0-2): 279, 35053, 86156, 34945, 293
https://tests.stockfishchess.org/tests/view/67a29fe0fedef70e42ac32ae

closes https://github.com/official-stockfish/Stockfish/pull/5867

Bench: 2582245
---
 src/search.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/search.cpp b/src/search.cpp
index 36823a08..be511791 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -804,7 +804,7 @@ Value Search::Worker::search(
     // false otherwise. The improving flag is used in various pruning heuristics.
     improving = ss->staticEval > (ss - 2)->staticEval;
 
-    opponentWorsening = ss->staticEval + (ss - 1)->staticEval > 5;
+    opponentWorsening = ss->staticEval > -(ss - 1)->staticEval;
 
     if (priorReduction >= 3 && !opponentWorsening)
         depth++;