+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);
+
+
+struct Log : public std::ofstream {
+ Log(const std::string& f = "log.txt") : std::ofstream(f.c_str(), std::ios::out | std::ios::app) {}
+ ~Log() { if (is_open()) close(); }
+};
+
+
+struct Time {
+ void restart() { system_time(&t); }
+ uint64_t msec() const { return time_to_msec(t); }
+ int elapsed() const { return int(current_time().msec() - time_to_msec(t)); }
+
+ static Time current_time() { Time t; t.restart(); return t; }
+
+private:
+ sys_time_t t;
+};
+
+
+template<class Entry, int Size>
+struct HashTable {
+ HashTable() : e(Size, Entry()) { memset(&e[0], 0, sizeof(Entry) * Size); }
+ Entry* operator[](Key k) { return &e[(uint32_t)k & (Size - 1)]; }
+
+private:
+ std::vector<Entry> e;
+};