Allow null pruning at depth 1

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 026086729823a18b4f6f1330cde97d22ea400bae..a81c85273aa4e6325e103dcd1d7ec1afc2636054 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -729,7 +729,6 @@ namespace {
 
     // Step 8. Null move search with verification search (is omitted in PV nodes)
     if (   !PvNode
-        &&  depth >= 2 * ONE_PLY
         &&  eval >= beta
         && (ss->staticEval >= beta - 35 * (depth / ONE_PLY - 6) || depth >= 13 * ONE_PLY)
         &&  pos.non_pawn_material(pos.side_to_move()))