Reductions simplification

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 7c797bef4087a2e62d58a1fe88359763fbe139e9..52541868b875c0e65d11bb1063e0982caa93fc51 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1222,10 +1222,6 @@ moves_loop: // When in check, search starts from here
           }
           else
           {
-              // Increase reduction for captures/promotions if late move and at low depth
-              if (depth < 8 && moveCount > 2)
-                  r++;
-
               // Unless giving check, this capture is likely bad
               if (   !givesCheck
                   && ss->staticEval + PieceValue[EG][pos.captured_piece()] + 210 * depth <= alpha)
@@ -1257,9 +1253,6 @@ moves_loop: // When in check, search starts from here
               int bonus = value > alpha ?  stat_bonus(newDepth)
                                         : -stat_bonus(newDepth);
 
-              if (move == ss->killers[0])
-                  bonus += bonus / 4;
-
               update_continuation_histories(ss, movedPiece, to_sq(move), bonus);
           }
       }
@@ -1557,7 +1550,6 @@ moves_loop: // When in check, search starts from here
 
       // Do not search moves with negative SEE values
       if (    bestValue > VALUE_TB_LOSS_IN_MAX_PLY
-          && !(givesCheck && pos.is_discovery_check_on_king(~pos.side_to_move(), move))
           && !pos.see_ge(move))
           continue;