Further increase SEE prune depth

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 0416c16cb3c89a9f7606d2ea6b4dd51173f53274..7a06dad93f94035b046c9384938ce6d8d0b983b1 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -885,7 +885,7 @@ split_point_start: // At split points actual search starts from here
           }
 
           // Prune moves with negative SEE at low depths
-          if (   predictedDepth < 3 * ONE_PLY
+          if (   predictedDepth < 4 * ONE_PLY
               && pos.see_sign(move) < 0)
           {
               if (SpNode)