The problem I've seen in the two other sources I've come across looks like this:
That same solution doesn't work in Sensei's version either, so this could be an example of a later edition correcting an error in an earlier one, as long as black in Sensei's version has a working solution (I haven't tried sensei's version yet). --gnostic?
White can force black to sacrifice some stones. I *think* this is the only answer that works. And of course it does not work in the other version of the problem:
unkx80: White can do better. BTW, where is ?
gnostic?: 6 captures 3.
gnostic?: If I'm not mistaken, the only first move that could possibly work is the warikomi at S16. So let's explore that next.
R16 is black's only follow up, so after that let's try the white nobi at T16:
gnostic?: I see now T 14 was the correct first move. Now I'm thinking something along these lines:
I haven't tried to refute this yet, but this might well be the solution.
(edit: this is the correct solution)
unkx80: Wrong. at a lives, and no sacrifice required.
So where did the incorrect variation of this problem come from? --gnostic?
(edit: After looking at the variation problem, I found that the same solution works, just the solution given in those versions was incorrect)
gnostic?: Ok, last attempt. And sorry about the bad diagram earlier unkx80.
unkx80: Yes, I think you got the solution. =)