Introduce Counter Move History tables

[stockfish] / src / movepick.cpp

diff --git a/src/movepick.cpp b/src/movepick.cpp
index b3f413bf1ffa0bd20255ccd5f25893839dfd1e45..d6a40d70af4c7d2d37305fe1f60dde62d6f51791 100644 (file)
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -67,8 +67,8 @@ namespace {
 /// search captures, promotions and some checks) and how important good move
 /// ordering is at the current node.
 
-MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h,
-                       Move* cm, Move* fm, Search::Stack* s) : pos(p), history(h), depth(d) {
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h, const CounterMovesHistoryStats& cmh,
+                       Move* cm, Move* fm, Search::Stack* s) : pos(p), history(h), counterMovesHistory(cmh), depth(d) {
 
   assert(d > DEPTH_ZERO);
 
@@ -87,8 +87,8 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats&
   endMoves += (ttMove != MOVE_NONE);
 }
 
-MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h,
-                       Square s) : pos(p), history(h) {
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats& h, const CounterMovesHistoryStats& cmh,
+                       Square s) : pos(p), history(h), counterMovesHistory(cmh) {
 
   assert(d <= DEPTH_ZERO);
 
@@ -112,8 +112,8 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const HistoryStats&
   endMoves += (ttMove != MOVE_NONE);
 }
 
-MovePicker::MovePicker(const Position& p, Move ttm, const HistoryStats& h, PieceType pt)
-                       : pos(p), history(h) {
+MovePicker::MovePicker(const Position& p, Move ttm, const HistoryStats& h, const CounterMovesHistoryStats& cmh, PieceType pt)
+                       : pos(p), history(h), counterMovesHistory(cmh) {
 
   assert(!pos.checkers());
 
@@ -162,8 +162,13 @@ void MovePicker::score<CAPTURES>() {
 
 template<>
 void MovePicker::score<QUIETS>() {
+  Square prevMoveSq = to_sq((ss-1)->currentMove);
+  Piece prevMovePiece = pos.piece_on(prevMoveSq);
+  const HistoryStats &cmh = counterMovesHistory[prevMovePiece][prevMoveSq];
+
   for (auto& m : *this)
-      m.value = history[pos.moved_piece(m)][to_sq(m)];
+      m.value =  history[pos.moved_piece(m)][to_sq(m)]
+               + cmh[pos.moved_piece(m)][to_sq(m)];
 }
 
 template<>