Extend moves which might be the only escape for mate, take 2

bench: 4835677
pb00068 · Oct 11, 2018 · 7e6c30c · 7e6c30c
1 parent 59acacb
commit 7e6c30c
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -930,6 +930,7 @@ namespace {
           extension = ONE_PLY;
       else if (mateCount >= 2
     		  && mateCount == moveCount - 1
+	          &&  eval >= beta - 120
 			  && !excludedMove)
     	  extension = ONE_PLY; // either this move also get mated (then extension don't hurts) or this is one of the very few escapes