.CKN file extension

This is the basic program to work with .CKN extension

ChessBase Light 2007 ChessBase Theme classification

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

.CKN 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.