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I would like to test my ranking system based on information theory. I need a database of games with outcomes and ranks of the single players. Where can I find this?

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up vote 6 down vote accepted

There was a Kaggle competition sponsored by the FIDE looking for an alternative to the current ELO system. The link is:

The dataset has over a million actual games covering ~50k players. There's also discussions of the alternative approaches used (the competition itself is now over) and scoreboard of metrics to see how well your ranking system compares.

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There is actually a rather large DB of chess games at I'm not sure how open they are with it, but it could be a good starting point.

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You could also try There is at least one API for accessing the data:

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