Extend last non-pawn captures

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index d3f38aae10954ec1eadefdbbc59cb6548e21b837..e976274f28fd4369dc8793b4782e80ef7e7cabc7 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1049,6 +1049,12 @@ moves_loop: // When in check, search starts from here
                && pos.pawn_passed(us, to_sq(move)))
           extension = 1;
 
+      // Last captures extension
+      else if (   PvNode
+               && PieceValue[EG][pos.captured_piece()] > PawnValueEg
+               && pos.non_pawn_material() <= 2 * RookValueMg)
+          extension = 1;
+
       // Castling extension
       if (type_of(move) == CASTLING)
           extension = 1;