Simplify away the passed pawn extension

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index c5b4332f7213aff47f8b618e89a3d8085dade0fb..83fb722faf6d2ac0922ee6ffbb1e730ca734a29d 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1126,12 +1126,6 @@ moves_loop: // When in check, search starts from here
                && (pos.is_discovery_check_on_king(~us, move) || pos.see_ge(move)))
           extension = 1;
 
-      // Passed pawn extension
-      else if (   move == ss->killers[0]
-               && pos.advanced_pawn_push(move)
-               && pos.pawn_passed(us, to_sq(move)))
-          extension = 1;
-
       // Last captures extension
       else if (   PieceValue[EG][pos.captured_piece()] > PawnValueEg
                && pos.non_pawn_material() <= 2 * RookValueMg)