All right, I'll make an attempt.
Now if White wins the ko, Black takes and we get the same jigo result as before. If White connects, Black takes the ko and White is without a sufficient ko threat.
Deebster: If White connects the ko, then Black at a, White block at b, and Black filling at , doesn't that leave the score at White +1 (with one prisoner each)?
Evand: No, the score is jigo -- Black has two prisoners, one from the ko and one from capturing ; White has one prisoner from the ko.
This looks like the winning move. Black is without a ko threat, and so White wins by 1 point. Cute problem.
-- Evand
xela: I notice that in the "jigo" diagram at the top of this page, black has the last move; whereas in the solution diagram, white has the last move (connecting the ko) and is one point better off. Is this a sort of tedomari?