The opening explorer is a very cool feature; thanks for making it. I would find it even more useful if I could filter the master games by year. I imagine this working the same way that the opening explorer rating filter for Lichess games works: a few sane options in a simple interface. So there could be four buttons, "All," "Last 10 Years," "Last 5 Years," and "Last Year." These options would be present for the master games and possibly also for the Lichess games (it seems more important for the master games).
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