thanatos13: a and b are miai nothing seems to be wrong thanks to the second eye.
unkx80: Nice try, but not good enough... (hint: you need to show strongest resistance of both players)
thanatos13: indeed, 2 at a would make a ko for life.
unkx80: I consider this as one of the two possible solutions for this problem.
Can you find the other solution?
I feel like my pride has been hurt for not seeing this.
unkx80: Sorry, this is even worse. Can you figure out how White can kill unconditionally?
thanatos13: :P noooo!! when thinking i saw the snapback if 3 at 4, 4 at 3.
This is the same ko, right? (If white 2 one point to the left, black is alive unconditionally with this same black 3).
unkx80: Yes. However, there are material differences in these two sequences to call them the same solution.