- // Decrease all the other played capture moves
- for (int i = 0; i < captureCount; ++i)
- {
- moved_piece = pos.moved_piece(captures[i]);
- captured = type_of(pos.piece_on(to_sq(captures[i])));
- captureHistory[moved_piece][to_sq(captures[i])][captured] << -bonus;
- }
+ // update_continuation_histories() updates histories of the move pairs formed
+ // by moves at ply -1, -2, and -4 with current move.
+
+ void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
+
+ for (int i : {1, 2, 4, 6})
+ if (is_ok((ss-i)->currentMove))
+ (*(ss-i)->continuationHistory)[pc][to] << bonus;