/** chess_db_exists( +DbLoc ).
Holds iff DbLoc is the absolute file path location of chess db.
Currently only works for directories which are assumed to hold prosqlite db/tables.
Currently, not in the module interface.
==
?-
absolute_file_name(pack('chess_db/examples/short'), Abs ),
chess_db:chess_db_exists( Abs ).
Abs = '.../swipl-7.7.18/pack/chess_db/examples/short'.
==
@author nicos angelopoulos
@version 0.1 2018/8/16
*/
chess_db_exists( Loc ) :-
exists_directory( Loc ).