It’s only checkmate if he’s currently in check and has no legal moves afaik.

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Liftoff is my favourite so far, but every time I use it I get the theme song from the old Australian kids show of the same name stuck in my head and it drives me insane.

I used Boost for a couple of years and will almost certainly be switching back to it as soon as it’s available, it’s set to download immediately from the play store when it releases.