Numbers are currently low, but it looks like Richard implemented these championships recently. Need more players to actually activate (same with some of the Go variants, like 37x37 and toroidal), but good to see this on the horizon.

Make sure you go and register if you're interested in playing at these sizes

Sweet, I'm up for a fresh slaughtering!

I forget–in Random Catchup user tournaments, the board is randomized uniquely for each game, right? So that'll probably be the case here, too?

I don't know for sure on the random boards, but would be surprised if it wasn't…I'm pretty certain that you can't guarantee a “rotation” of boards in an odd-numbered tournament (unless you play on the same boards twice), and I doubt Richard did additional work to make that happen. Just copy over the pre-existing random board algorithm.