SEE simplification

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 187f21694ef932d543eb474f8914719d9c2a46f1..af8ddaba5a420887d0c5a98907b7ca975d4b802d 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1017,8 +1017,8 @@ moves_loop: // When in check, search starts here
           {
               // Continuation history based pruning (~20 Elo)
               if (   lmrDepth < 5
-                  && (*contHist[0])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1))
-                  && (*contHist[1])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1)))
+                  && (*contHist[0])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth
+                  && (*contHist[1])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth)
                   continue;
 
               // Futility pruning: parent node (~5 Elo)
@@ -1027,7 +1027,7 @@ moves_loop: // When in check, search starts here
                   continue;
 
               // Prune moves with negative SEE (~20 Elo)
-              if (!pos.see_ge(move, Value(-(30 - std::min(lmrDepth, 18)) * lmrDepth * lmrDepth)))
+              if (!pos.see_ge(move, Value(-21 * lmrDepth * lmrDepth - 21 * lmrDepth)))
                   continue;
           }
       }