extern const char ashell_h[ SHELL_H_LEN ];
extern const unsigned char aifile[ nsquare ];
extern const unsigned char airank[ nsquare ];
+extern int move_list[], move_ptr; // [HGM] undo: game history (used in proce.c and makemove.c)
void pv_close( tree_t * restrict ptree, int ply, int type );
void pv_copy( tree_t * restrict ptree, int ply );