-extern void acquirement(int y1, int x1, int num, bool great, bool special, bool known);
-extern void amusement(int y1, int x1, int num, bool known);
-extern void init_normal_traps(void);
-extern s16b choose_random_trap(void);
-extern void disclose_grid(int y, int x);
-extern void place_trap(int y, int x);
+extern void acquirement(POSITION y1, POSITION x1, int num, bool great, bool special, bool known);
+extern void amusement(POSITION y1, POSITION x1, int num, bool known);