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12PointFunProblem

 

1-2 point - fun problem / attempts
Sub-page of 12PointFunProblem

Push two times

[Diagram]
Get thick first

Well, this is what I've come up with. When white pushes out, black needs to get a little thickness first (otherwise, white can squiggle her way to freedom).

Alex Weldon: It's probably better to push once more. W still won't have enough eyespace to live.


[Diagram]
Maintaining two split groups

If white cuts here at W1, then black must atari at B2 (an atari at W3 will cause big headaches for black). When white extends to W3, black must extend to B4. I believe black is well equipped to handle white's next step (three of which I've explored, none of which seem to work).


[Diagram]
Strong though split

If white tries to go after the two black stones on the left, black has a series of ataris that will keep him safe. If white tries to go after the ones at the top, B6 and B8 take care of things. (Neither can white extend up at the top; because of the marked black stone, this atari-capture move is useful for black more than once.) Note that white cannot atari at a for the same reason.

At this point (or at least after he plays at a), black has enough liberties to overcome white's four in the corner.


[Diagram]
Still strong

If white goes after the stones up top, we just speed the process up a bit.


[Diagram]
Tricky but not intractable

If white moves up with W1, then black must be careful and extend first with B2. Otherwise, white can capture those two and be safe (the atari-capture moves don't work if black omits this move). After B8, black -- again -- has enough liberties to win the semeai.

I will now step aside and let others show me all my mistakes.

-- Scartol



Arno: one mistake I found (unless I am mistaken :-)

[Diagram]
does not work

Note: B2 should be at 'a' to reduce White's liberties, but anyway. After the sequence to B10 White plays 'b' and is safe. Black cannot cut at 'c' and therefor White is safe. Also, 'd' is sente, as there is no ko threat to be found anywhere.


[Diagram]
does not work

unkx80: Actually, I thought W3 will capture BC cleanly.



[Diagram]
Clamp

Joshual000 What about the clamp?


[Diagram]
Clamp Example Variation


Push two times then jump

[Diagram]
Jump

[Diagram]
Jump (continued)

The jump fails also.



Push three times

[Diagram]
Push three times

[Diagram]
3-Push (continued)

Black has no answer after W10.

So instead of B7 ...


[Diagram]
another try

Again Black has no answer after W10.

So instead of B5 ...


[Diagram]
another try

and again, W10 thwarts Black's plans as the BC stones will get captured.



So is the stone alive?



This is a copy of the living page "1-2 point - fun problem / attempts" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.