Adjust history threshold for quiet moves futility pruning

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 12a4c7bff10d15e0b73ed837e93a9d154fafda00..b173cd3bb32b60fee4b7905996d93f83301651e1 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -276,7 +276,7 @@ namespace {
                          : attacks_bb<Pt>(s, pos.pieces());
 
         if (pos.blockers_for_king(Us) & s)
-            b &= LineBB[pos.square<KING>(Us)][s];
+            b &= line_bb(pos.square<KING>(Us), s);
 
         attackedBy2[Us] |= attackedBy[Us][ALL_PIECES] & b;
         attackedBy[Us][Pt] |= b;
@@ -743,7 +743,6 @@ namespace {
                     + 24 * infiltration
                     + 51 * !pos.non_pawn_material()
                     - 43 * almostUnwinnable
-                    -  2 * pos.rule50_count()
                     -110 ;
 
     Value mg = mg_value(score);
@@ -857,7 +856,12 @@ namespace {
     }
 
     // Side to move point of view
-    return (pos.side_to_move() == WHITE ? v : -v) + Tempo;
+    v = (pos.side_to_move() == WHITE ? v : -v) + Tempo;
+
+    // Damp down the evaluation linearly when shuffling
+    v = v * (100 - pos.rule50_count()) / 100;
+
+    return v;
   }
 
 } // namespace