Sorry, saw this amusing discussion, and decided to follow up. I find it pretty entertaining! Treat it as a contest!
At what point does White have to reply?
The person in the discussion started with the circled point, but I would play at a. Comments and solutions here please!
Purely by feeling I'd say four moves for seki.
Skelley White can make a second eye like this...
Jasonred Why does Black play at ? I mean, I see nowhere else to play, but, why? Trying to make sure it's a true eye, not a false one?
Skelley: True, Black does not have to respond at all, White can live with two eyes. I just put and in to show that White can live even if Black responds.
unkx80: How is this?
W: Seems to be it. Best White can do seems to be mutual life either with two eyes each or seki
Jasonred : I think the stone in the center isn't necesary. Or would be better at a. If my four stones there don't work, I'd like to try one at a. I'm not sure, of course. But it looks good to me. Assuming, Of course, that you were given 4-5 tenukis.
Ikken Tobi in the middle of your formation! Eat that! Furthermore, white Cannot get an eye in there without capturing. If this doesn't work, I'll plunk a stone at either of the circled points. I'm pretty sure that would work. I'm not sure which is stronger though. Or I could place my 5th stone on the squared point instead, heh.
W: Neither seem to work for black. Four stones just ain't enough for anything; white can always get one eye more than black, and keep black limited to one or less.