posetcay: For some reason review mode is broken for this one. In review mode white plays first, but when I play the tsumego normally black goes first when it is black to play.
posetcay: I fixed the problem as best as I could, it is solvable now.
d4rkm4tter: Ok, nice. You made it solvable by removing the exchanges in the corner. Inverting colors is another approach that I also made 2-3 times in the Cho Chikun Intermediate collection.
posetcay: @jhubert I disagree, N2-O1 and it is still impossible to live for black. If you check the problem in the link kovarex provided, that is what the problem is supposed to look like.
kovarex: Anyway, if we agree that the problem is broken, we should decide how to fix it.
In similar situations in my weiqi collection, what I did was to simply invert colors, add the first move, and change the problem as white to kill.
kovarex: Interesting, it is almost identical shape as this problem I was adding.
https://tsumego-hero.com/tsumegos/play/24716?orientation=bottom
But the crucial difference is, that in the linked problem, the corner exchange is still open, and the solver has 2 ways to threat to live in the corner, and has to use one way or another based on the way the second move is answered.
But here, the corner sequence was already done before the asking move, so the opponent can just select the move that works.
Added this as an alternative correct move.