Fix a skill level problem: Don't allow move pruning at root node

locutus2 · zamar · commit d8b3ad220832 · 2015-01-25T21:57:13.000Z
Bench: 8918745 Resolves #231
diff --git a/src/search.cpp b/src/search.cpp
@@ -831,7 +831,8 @@ namespace {
       newDepth = depth - ONE_PLY + extension;
 
       // Step 13. Pruning at shallow depth
-      if (   !captureOrPromotion
+      if (   !RootNode
+          && !captureOrPromotion
           && !inCheck
           && !dangerous
           &&  bestValue > VALUE_MATED_IN_MAX_PLY)
