Adjust singular LMR for positions seen in PV

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index a54e181a2a906e1033848d9983655a7805eb24cf..fe57806c7076198fee080a659dbd4d7161a5c46a 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1149,7 +1149,7 @@ moves_loop: // When in check, search starts from here
 
           // Decrease reduction if ttMove has been singularly extended (~3 Elo)
           if (singularLMR)
-              r -= 2;
+              r -= 1 + (ttPv && !PvNode);
 
           if (!captureOrPromotion)
           {