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Why PGN and CBF formats ? PGN is the universal standard, easy to read, well documented, but not very efficient. CBF is less universal than PGN but an important Web standard for chess data bases in general. It is remarkable smaller than PGN. Its format has been decrypted and made available on the Web by Horst Aurisch, so that many other programs (ChessVU among them) have been able to handle it.
CBH is the new ChessBase format, but has many disadvantages, the first one being the fact that ChessBase people don’t want to share the format (no documentation available), the second one the number of needed files (this can be in a way avoided using CBV archives, but it’s the same like using ZIP, only less comfortable, and of course less standard). So, let’s forget it.
The CBF format has several bugs and limitations, but is still the best compromise. I hope that leading Web sites like TWIC will keep using CBF in the future.