From 33ca971db271a7eab0f9f4a100f68083f4c71a5b Mon Sep 17 00:00:00 2001
From: Stefano Cardanobile <stefano.cardanobile@gmail.com>
Date: Fri, 7 Sep 2018 20:18:01 +0200
Subject: [PATCH] Irreversible moves help winning. Bench: 4094170

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

diff --git a/src/search.cpp b/src/search.cpp
index 86a6b19a408..2d7a4b76e41 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1042,7 +1042,7 @@ namespace {
                   r += ONE_PLY;
 
               // Decrease/increase reduction for moves with a good/bad history (~30 Elo)
-              r -= (ss->statScore - 16 * bestValue * thisThread->irreversibleMoves ) / 20000 * ONE_PLY;
+              r -= (ss->statScore + 16 * bestValue * thisThread->irreversibleMoves ) / 20000 * ONE_PLY;
           }
 
           Depth d = std::max(newDepth - std::max(r, DEPTH_ZERO), ONE_PLY);