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It’s not even about the database per se… what’s not easily replicated are the annotated (commented/analyzed) games, high quality metadata.

This actual software, in terms of UI, is basically shit, and the technology is questionable (search really should be an order faster - my understanding is it has to do a full sequential read of the main DB (which is several GB)

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Depends on what you're searching for. For position lookup, there's an index; for something like a given player, it's likely to be a linear scan.

Some format documentation:

https://web.archive.org/web/20160329061708/http://rybkaforum...

http://talkchess.com/forum/viewtopic.php?topic_view=threads&...

Oh, the software is absolutely awful, and you're spot on about the metadata (and the CBH format as a whole,) but I would also toss in another point where it's (sadly) the best: Opening prep. There just isn't much else that can compare despite the awful interface.

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