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but then that would be too hard for people to play I feel

Maybe in that case, just limit the boundaries from ultra to hyper.

Yeah, this should be considered, but the number of people who can play blindfold chess in general is questionable.

I think this would be fun. Very fascinating time control, and I can imagine it will become popular as ultra.

https://lichess.org/tvjXARAw8nCL Arghhh, so close ;-;