.CK1 file extension

This is the basic program to work with .CK1 extension

ChessBase Light 2007 ChessBase Theme classification

The program works with the following extensions: cbe, cp3, cbf, cpn, cpo, cbh, ctb, cbm, ctg, cto, cbp, pgi, cbt, pgn, cbv, cbz, cib, cit, ck1, cbs, ck2, cko, ck3, cba, ckn, cbb, cp1, cbc, cp2 and cbgi

.CK1 extension is also supported by the following programs:

ChessBase 9 ChessBase Theme classification

ChessBase ChessBase Theme classification

ChessBase 13 is a personal, stand-alone chess database.

ChessBase Reader ChessBase Theme classification

Open chess games database files and play through the games.