Simplify LMR for captures

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index b87c689479d2a7909667a591d31c49b6b6cc21d4..0574da5897274c2653f82234675a08545de9c644 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -996,8 +996,7 @@ moves_loop: // When in check, search starts from here
           if (captureOrPromotion) // (~5 Elo)
           {
               // Increase reduction by comparing opponent's stat score
-              if (   (ss-1)->statScore >= 0
-                  && thisThread->captureHistory[movedPiece][to_sq(move)][type_of(pos.captured_piece())] < 0)
+              if ((ss-1)->statScore >= 0)
                   r += ONE_PLY;
 
               r -= r ? ONE_PLY : DEPTH_ZERO;
@@ -1166,7 +1165,8 @@ moves_loop: // When in check, search starts from here
         if (!pos.capture_or_promotion(bestMove))
             update_quiet_stats(pos, ss, bestMove, quietsSearched, quietCount, stat_bonus(depth));
         else
-            update_capture_stats(pos, bestMove, capturesSearched, captureCount, stat_bonus(depth));
+            update_capture_stats(pos, bestMove, capturesSearched, captureCount,
+                                 stat_bonus(depth + (bestValue > beta + KnightValueMg ? ONE_PLY : DEPTH_ZERO)));
 
         // Extra penalty for a quiet TT move in previous ply when it gets refuted
         if ((ss-1)->moveCount == 1 && !pos.captured_piece())