Adjust pruning constants

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 86af39183fbb7631c355095506def88daf16e1b8..58873c8981f3f5dd007d21823e7125cbe3af5607 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1040,7 +1040,7 @@ moves_loop: // When in check, search starts here
                   continue;
 
               // SEE based pruning (~9 Elo)
-              if (!pos.see_ge(move, Value(-218) * depth))
+              if (!pos.see_ge(move, Value(-217) * depth))
                   continue;
           }
           else
@@ -1051,7 +1051,7 @@ moves_loop: // When in check, search starts here
 
               // Continuation history based pruning (~2 Elo)
               if (   lmrDepth < 5
-                  && history < -3000 * depth + 3000)
+                  && history < -3875 * (depth - 1))
                   continue;
 
               history += thisThread->mainHistory[us][from_to(move)];
@@ -1059,7 +1059,7 @@ moves_loop: // When in check, search starts here
               // Futility pruning: parent node (~9 Elo)
               if (   !ss->inCheck
                   && lmrDepth < 8
-                  && ss->staticEval + 142 + 139 * lmrDepth + history / 64 <= alpha)
+                  && ss->staticEval + 138 + 137 * lmrDepth + history / 64 <= alpha)
                   continue;
 
               // Prune moves with negative SEE (~3 Elo)