+#define board_size 8 /* 8 */
+//extern const int board_size; /* 8 */
+
+extern const unsigned int empty; /* 0 */
+extern const unsigned int black; /* 1 */
+extern const unsigned int white; /* 2 */
+
+extern const unsigned int player_one; /* black */
+extern const unsigned int player_two; /* white */
+
+extern const unsigned int hint_allowed; /* legal place for a pawn */
+extern const unsigned int hint_forbidden; /* illegal place for a pawn */
+
+extern const unsigned int north;
+extern const unsigned int north_east;
+extern const unsigned int east;
+extern const unsigned int south_east;
+extern const unsigned int south;
+extern const unsigned int south_west;
+extern const unsigned int west;
+extern const unsigned int north_west;
+