extern const std::string move_to_uci(Move m, bool chess960);
extern const std::string move_to_san(Position& pos, Move m);
extern const std::string move_to_uci(Move m, bool chess960);
extern const std::string move_to_san(Position& pos, Move m);
int elapsed() const { return int(current_time().msec() - time_to_msec(t)); }
static Time current_time() { Time t; t.restart(); return t; }
int elapsed() const { return int(current_time().msec() - time_to_msec(t)); }
static Time current_time() { Time t; t.restart(); return t; }