Null move only for depth > OnePly

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/search.cpp b/src/search.cpp
index 2fdc5ad11055828c71d6b88d543b5325fd60176f..a54d41b9c8fbb34353e3451edfe8739104edf0d9 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1139,6 +1139,7 @@ namespace {
 
     // Null move search
     if (    allowNullmove
 
     // Null move search
     if (    allowNullmove

+        &&  depth > OnePly

         && !isCheck
         &&  ok_to_do_nullmove(pos)
         &&  approximateEval >= beta - NullMoveMargin)
         && !isCheck
         &&  ok_to_do_nullmove(pos)
         &&  approximateEval >= beta - NullMoveMargin)