The sample.pgn PGN fileThe PGN file sample.pgn download is a collection of approximately 200 endgame studies selected from the Heijden database. The full Heijden database contains more than 85000 endgame studies, and we recommend it for use with CQL (or, for that matter, for anyone interested in endgame studies).
The studies in
sample.pgn were selected so that each of the CQL examples would find some matches when run against the database. Although there are many interesting studies among the 200 studies here, many of them were programmatically selected to make the examples all work - this is not intended as a "best studies" collection.
To use the
sample.pgn database on a cql file named
cql using this syntax:
cql -i sample.pgn foo.cql
This will create a file named
foo-out.pgn located in the directory from which
cql was run.
sample.pgn file also contains one problem, to illustrate
the use of CQL on a problem theme.