Singular extension at 8 plies also for PV nodes

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 17d52cae5febf53739f97e78e0ab254e3e7d5b83..061689e8f5bd3112af85388028a1fbeba51a690c 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -780,7 +780,7 @@ moves_loop: // When in check and at SpNode search starts from here
 
     singularExtensionNode =   !RootNode
                            && !SpNode
-                           &&  depth >= (PvNode ? 6 * ONE_PLY : 8 * ONE_PLY)
+                           &&  depth >= 8 * ONE_PLY
                            &&  ttMove != MOVE_NONE
                            && !excludedMove // Recursive singular search is not allowed
                            && (tte->bound() & BOUND_LOWER)