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I will help you with this

Currently this page exists, where you can manually sign out other computers/devices https://en.lichess.org/account/security

i can find it if i scroll down a bit on the profile games are never removed (with some exceptions for aborted games)

It already do, however if your ping fluctuates very quickly it might not keep up. Last I looked at the code, it was updating every 2 seconds using some deviation formula to even it out a bit.

The codebase would be too hard to maintain with all the differences, just supporting some of the possible variants is big enough. The user interface would also be harder to use, with all the different…

Glicko2 will correct itself after a few games, which is better than poking it manually. I agree it wound be nice if it wasn't included when calculating the stats.

Probably this one https://github.com/ornicar/lila/blob/e4760befcc49766e1b3c2a3f21396e2998677d67/public/javascripts/tournamentForm.js#L32 which sets display block on the row https://github.com/ornicar/…

It's disabled

I hope that the warning doesn't look like that, also I don't think you can trust those computers for doing anything important/private.

Known issue yes, but not currently being worked on. I think about 1% of the games is crazyhouse, even fewer correspondence. Sadly devtime is a scarcity. https://github.com/ornicar/lila/issues/1578