Check Extension with Static Evaluation

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 9de8cc9c092bf9b82e4db12d52bafd378af2dcb4..2b4e4f1e8434652e8ff54f0c30ec612d96795fcd 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1097,6 +1097,10 @@ moves_loop: // When in check, search starts from here
                   return beta;
           }
       }
+      else if (   givesCheck
+               && depth > 6
+               && abs(ss->staticEval) > Value(100))
+          extension = 1;
 
       // Add extension to new depth
       newDepth += extension;
@@ -1273,7 +1277,6 @@ moves_loop: // When in check, search starts from here
               else
               {
                   assert(value >= beta); // Fail high
-                  ss->statScore = 0;
                   break;
               }
           }