Remove futility pruning depth limit

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 5974cba731ef04a6c71885216e92818392aa5c8d..008a60ede4a6138c47901d8c359fbcc64aa2707c 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -780,7 +780,6 @@ namespace {
 
     // Step 7. Futility pruning: child node (~50 Elo)
     if (   !PvNode
-        &&  depth < 9
         &&  eval - futility_margin(depth, improving) >= beta
         &&  eval < VALUE_KNOWN_WIN) // Do not return unproven wins
         return eval;