- Move m = moves[i].move;
- moves[i].score = pos.see(m);
- if (moves[i].score >= 0)
- moves[i].score = move_promotion(m) ? QueenValueMidgame
- : pos.midgame_value_of_piece_on(move_to(m));
+ m = moves[i].move;
+ from = move_from(m);
+ to = move_to(m);
+
+ bool hxl = ( int(pos.midgame_value_of_piece_on(from))
+ -int(pos.midgame_value_of_piece_on(to)) > 0)
+ || pos.type_of_piece_on(from) == KING;
+
+ // Avoid calling see() for LxH and equal captures because
+ // SEE is always >= 0 and we order for MVV/LVA anyway.
+ seeValue = (hxl ? pos.see(m) : 0);
+
+ if (seeValue >= 0)
+ {
+ if (move_promotion(m))
+ moves[i].score = QueenValueMidgame;
+ else
+ moves[i].score = int(pos.midgame_value_of_piece_on(to))
+ -int(pos.type_of_piece_on(from));
+ }
+ else
+ {
+ // Losing capture, move it to the badCaptures[] array
+ assert(numOfBadCaptures < 63);
+ moves[i].score = seeValue;
+ badCaptures[numOfBadCaptures++] = moves[i];
+ moves[i--] = moves[--numOfMoves];
+ }