Small cleanups

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 582e44576b37dda94eb71fc372daf7d4820a1d64..d6571a140f36b1e9ab5293895aff192df271a785 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -601,7 +601,6 @@ namespace {
 
     assert(0 <= ss->ply && ss->ply < MAX_PLY);
 
-    (ss+1)->ttPv         = false;
     (ss+1)->excludedMove = bestMove = MOVE_NONE;
     (ss+2)->killers[0]   = (ss+2)->killers[1] = MOVE_NONE;
     (ss+2)->cutoffCnt    = 0;
@@ -1071,11 +1070,10 @@ moves_loop: // When in check, search starts here
               && (tte->bound() & BOUND_LOWER)
               &&  tte->depth() >= depth - 3)
           {
-              Value singularBeta = ttValue - (2 + (ss->ttPv && !PvNode)) * depth;
+              Value singularBeta = ttValue - (3 + 2 * (ss->ttPv && !PvNode)) * depth / 2;
               Depth singularDepth = (depth - 1) / 2;
 
               ss->excludedMove = move;
-              // the search with excludedMove will update ss->staticEval
               value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
               ss->excludedMove = MOVE_NONE;