Simplify away late irreversible move extension

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 5f545ef62fca42aa1a0f19acadae840006bae291..b96efad09aa615af0dd6fda0db756dcaef402905 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1142,12 +1142,6 @@ moves_loop: // When in check, search starts from here
                && pos.non_pawn_material() <= 2 * RookValueMg)
           extension = 1;
 
                && pos.non_pawn_material() <= 2 * RookValueMg)
           extension = 1;
 

-      // Late irreversible move extension
-      if (   move == ttMove
-          && pos.rule50_count() > 80
-          && (captureOrPromotion || type_of(movedPiece) == PAWN))
-          extension = 2;
-

       // Add extension to new depth
       newDepth += extension;
 
       // Add extension to new depth
       newDepth += extension;