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SnapbackProblem8

 

Snapback8Solution
   

[Diagram]
Diag.: How's this?

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 inconspicous bottom of the page... anyhow, I think I got it this time...



[Diagram]
Diag.: Moving toward SP7?

Scartol: Well, this sequence takes us to the same situation we had in Snapback Problem 7. But I feel like that's too simple. At least it's a start..?



Obviously white 4 in the above is not forced, but seems like a natural move that leads to disaster.


[Diagram]
Diag.: White 4 ?

A white move @ a is bad, see last problem Snapback Problem 7. Depending up the outside position, white b or c are called for.



[Diagram]
Diag.: Lemme try.

unkx80: White 6 in this diagram is very naive in immediately capturing the black stone. If White 6 connects at 7, the Black group will die.


[Diagram]
Diag.: Resulting in...

Giving black the corner, at the cost of 2 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 mis-understanding about these types of probblems. 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 the 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 snap back can be, how weak White's original position was, and how strong Black's orginal position was. Well, perhaps Black was not strong, but it had alot of potential, aji (?)



[Diagram]
Diag.: White 4 goes where ?


[Diagram]
Diag.: White 4 at a, failure

White 4 at a is a failure, see Snapback Problem 7



[Diagram]
Diag.: White 4 at b, success?

Clearly this position only favors white, if we assume something about white's relatively strong position (not shown in the original problem). Else the two lone white stones near the edge will probably die a quick death.



[Diagram]
Diag.: White 4 at c, success?

This option for white 4 seems more risky, but relies less on assuming something about the surronding white position.

White @ 6 seems safe (but I have not worked out all the details about it). Depending upon how the ladder works, white 6 @ z kills black 3 and 5.

Of course black 5 may not be forced.........



[Diagram]
Diag.: White 4 at c, Failure

And black seems to escape. If the marked white stone is to be saved, then white 7 @ q is needed. But then black 8 @ r kills the two white stones.

As shown in Snapback Problem 7, for white to capture @ d was death then, and probably still is death.



[Diagram]
Diag.: White success? maybe

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 5 @ e, white connects with q and seems to avoid problems (his two stones lost in the above variations are now stronger with 4)


[Diagram]
Diag.: How about the top of the page?

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 at the edge... does this work then? This is how to take advantage of white playing at 4 instead of a, sorta. Anyhow, white a or b are replied by c, which gives black enough room for eyespaces methinks.


[Diagram]
Diag.: How about the top of the page?

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...



This is a copy of the living page "Snapback8Solution" at Sensei's Library.
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