extern void dbg_mean_of(int v);
extern void dbg_print();
-class Position;
-extern Move move_from_uci(const Position& pos, std::string& str);
-extern const std::string move_to_uci(Move m, bool chess960);
-extern const std::string move_to_san(Position& pos, Move m);
-
struct Log : public std::ofstream {
Log(const std::string& f = "log.txt") : std::ofstream(f.c_str(), std::ios::out | std::ios::app) {}