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).

Warfreak2: "then black must atari at B2 (an atari at W3 will cause big headaches for black)". Do not automatically atari every cutting stone! Black need not atari at all, just extend, to get liberties.

[Diagram]
Maintaining two split groups  

See also the 123 Principle. However, either way, White can escape now with W3 tesuji.

[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 black+circle 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 black+circle stones will get captured.


So is the stone alive?


[Diagram]
The solution  

iopq: After this the white stone is dead.

[Diagram]
Life?  

Mef: Unless I'm misreading, at the very least after W4 'a' and 'b' are miai. If B4 then white at 'c' should escape and live easily.


[Diagram]
Reverse Monkey Jump  

Warfreak2: Catch me if you can.


[Diagram]
19x19 diagram  

This pattern repeats, until ...

[Diagram]
19x19 diagram  

Black can't allow White to play at B3 because she would make a second eye. B7 makes a ko.

White has many ko threats starting with a.

Alternatively, White can push through at b or any other gap.

So, no!


1-2 point - fun problem / attempts last edited by Dieter on April 18, 2020 - 15:32
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