# 1-2 point - fun problem / attempts

Sub-page of 12PointFunProblem

### Push two times

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.

Maintaining two split groups

If white cuts here at , then black must atari at (an atari at will cause big headaches for black). When white extends to , black must extend to . 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 (an atari at will cause big headaches for black)". Do not automatically atari every cutting stone! Black need not atari at all, just extend, to get liberties.

Maintaining two split groups

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

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, and 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.

Still strong

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

Tricky but not intractable

If white moves up with , then black must be careful and extend first with . Otherwise, white can capture those two and be safe (the atari-capture moves don't work if black omits this move). After , 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 :-)

does not work

Note: should be at 'a' to reduce White's liberties, but anyway. After the sequence to 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.

does not work

unkx80: Actually, I thought will capture cleanly.

Clamp

Clamp Example Variation

### Push two times then jump

Jump
Jump (continued)

The jump fails also.

### Push three times

Push three times
3-Push (continued)

Black has no answer after .

another try

Again Black has no answer after .

another try

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

So is the stone alive?

The solution

iopq: After this the white stone is dead.

Life?

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

Reverse Monkey Jump

Warfreak2: Catch me if you can.

19x19 diagram

This pattern repeats, until ...

19x19 diagram

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