This is just a try, but it seems to work. Alain Wettach
I don't think that this is a difficult problem for a 4 dan. But it does not work without , which might become useful. --HolIgor
How about playing on the other 1-2 point to live :) Goran
DieterVerhofstadt (2k): Well, White occupies the other 1-2 point, I guess (#:-7). Now Black's answers are a, b, or c. How to refute at b or c is easy to see, but a might be more difficult.
... and Black can't make his second eye because of shortage of liberties.
That leaves us with the ko... Goran