5x5 tsumego

I recall there is a Japanese pro who draws 5x5 tsumego along with his autograph on fans
Who is that pro and where can I find some of those tsumego?

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Don’t know about 5x5 tsumego. The closest thing I know is Cho U made lots of 4x4 tsumegoes


Right, that’s the one
I couldn’t find a set of those tsumego online, are any available?

Yes, at least partially.

Nihon ki-in’s app (not free. The link is for IOS, not sure if you can find it for android.):

101weiqi collections of 4x4 puzzles (maybe not all of them are created by Cho U):

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