X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=8be96e298ec17aa2936bb47c1150d79a02d518c2;hp=886ed52ca0bbf65f3fca476d4bffe12a650f44d2;hb=f4c27cda1a6874550fcbf6cf991b0b9abe43ff39;hpb=5ccff25df2e8fcbee3d4c1428bbc101afa88e700

diff --git a/src/search.cpp b/src/search.cpp
index 886ed52c..8be96e29 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1134,6 +1134,12 @@ moves_loop: // When in check, search starts from here
       // Castling extension
       if (type_of(move) == CASTLING)
           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;