Update search.cpp

bench: 1393911
official-stockfish · Nov 13, 2023 · ddd6aab · ddd6aab
1 parent fbc6b27
commit ddd6aab
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/search.cpp b/src/search.cpp
@@ -1100,6 +1100,12 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
             else if (PvNode && move == ttMove && move == ss->killers[0]
                      && (*contHist[0])[movedPiece][to_sq(move)] >= 4194)
                 extension = 1;
+
+            // Recapture extensions (~1 Elo)
+            else if (PvNode && move == ttMove && to_sq(move) == prevSq
+                     && captureHistory[movedPiece][to_sq(move)][type_of(pos.piece_on(to_sq(move)))]
+                          > 4000)
+                extension = 1;
         }
 
         // Add extension to new depth