Double weight of pawn history for quiet move ordering.

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 0aba9a55fe79d5b25d53da9b2e4e3e0f6ca19e1d..798f51ddb6e56d2c5918c6be26ba64d4de8c46ec 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -181,12 +181,12 @@ void MovePicker::score() {
 
             // histories
             m.value = 2 * (*mainHistory)[pos.side_to_move()][from_to(m)];
+            m.value += 2 * (*pawnHistory)[pawn_structure(pos)][pc][to];
             m.value += 2 * (*continuationHistory[0])[pc][to];
             m.value += (*continuationHistory[1])[pc][to];
             m.value += (*continuationHistory[2])[pc][to] / 4;
             m.value += (*continuationHistory[3])[pc][to];
             m.value += (*continuationHistory[5])[pc][to];
-            m.value += (*pawnHistory)[pawn_structure(pos)][pc][to];
 
             // bonus for checks
             m.value += bool(pos.check_squares(pt) & to) * 16384;
@@ -302,7 +302,7 @@ top:
             endMoves = generate<QUIETS>(pos, cur);
 
             score<QUIETS>();
-            partial_insertion_sort(cur, endMoves, -3000 * depth);
+            partial_insertion_sort(cur, endMoves, -1960 - 3130 * depth);
         }
 
         ++stage;