size_t size() const { return last - mlist; }
bool contains(Move m) const {
for (const MoveStack* it(mlist); it != last; ++it) if (it->move == m) return true;
size_t size() const { return last - mlist; }
bool contains(Move m) const {
for (const MoveStack* it(mlist); it != last; ++it) if (it->move == m) return true;