Jasonred Since the whole page started turning into a mess, I decided to move my attempted solution upwards... and if it proves to be wrong, I'll just move it back down to the inconspicuous bottom of the page... anyhow, I think I got it this time...
Obviously in the above is not forced, but seems like a natural move that leads to disaster.
A white move at a is bad (see last problem Snapback Problem 7). Depending upon the outside position, White b or c are called for.
unkx80: in this diagram is very naive in immediately capturing the black stone. If connects at , the black group will die.
Giving Black the corner, at the cost of two stones??? Ummm... a little help please?
As shown in Snapback Problem 7, for White to take with the marked stone seems bad in all variations.
Also I think there is a misunderstanding about these types of problems. The right edge of the game diagram shown in the original problem is not the corner of the game board. That is what the above comment meant that White's fourth move depends upon the outside position.
With that understanding, White can only prevent Black escaping assuming a decent outside position (not shown in the original problem). Which shows how strong snapback can be, how weak White's original position was, and how strong Black's original position was. Well, perhaps Black was not strong, but it had a lot of potential, aji (?)
at a is a failure, see Snapback Problem 7
Clearly this position only favors White, if we assume something about White's relatively strong position (not shown in the original problem). Or else the two lone white stones near the edge will probably die a quick death.
This option for seems more risky, but relies less on assuming something about the surrounding white position.
seems safe (but I have not worked out all the details about it). Depending upon how the ladder works, at z kills and .
Of course may not be forced...
And Black seems to escape. If the marked white stone is to be saved, then at q is needed. But then at' 'r'' kills the two white stones.
As shown in Snapback Problem 7, for White to capture at d was death then, and probably still is death.
Thus the only way for White to prevent the black escape is as shown, and that depends on a strong outside position.
Also if Black plays at e, White connects with q and seems to avoid problems (her two stones lost in the above variations are now stronger with ).
Jasonred Hopefully, there's no misunderstanding about the top of the page borders as well as the right and bottom... anyhow, Black wouldn't be in trouble if it wasn't on the edge... does this work then? This is how to take advantage of White playing at instead of a, sort of. Anyhow, White a or b are answered by c, which gives Black enough room for eye space, methinks.
If you want a version which takes snapback into account, how's about this? Once again, from the top... and please tell me that this sequence is correct...
Charles Yes, the cut at here is what the One-Two-Three idea immediately suggested to me. That is, White ought not to play this way; so White defends, Black lives, and Black hasn't played an unnecessary stone at .