yearfilter takes a range as its argument:
year 2000 year 2001 2005It matches a game whose date field's year is within the year. It can be specified as a CQL parameter or in the body of the CQL file.
year filter can be counted in which case it counts the year
of the game, if that year lies within the range.
For example, to sort games by year, use:
cql(input i.pgn) sort year 2000 2017The
yearfilter can also be specified on the command line using --year. Examples