+extern const std::string engine_info(bool to_uci = false);
+extern int cpu_count();
+extern void timed_wait(WaitCondition&, Lock&, int);
+extern void prefetch(char* addr);
+extern void start_logger(bool b);
+
+extern void dbg_hit_on(bool b);
+extern void dbg_hit_on_c(bool c, bool b);
+extern void dbg_mean_of(int v);
+extern void dbg_print();
+
+class Position;
+extern Move move_from_uci(const Position& pos, const 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);