Beginner Exercise 144 / Attempts

Sub-page of BeginnerExercise144
[Diagram]

White to play.

Zephi: This one seems a bit complicated, but I can see at least two possibilities. Focusing on only the two marked stones, white needs B to keep them from escaping, but can't play there without being immediately captured, so I think white would have to first set up a ko at point A. After this, I think that B and C are miai for capturing, though white would need some good ko threats to make B work. Here's how I think both cases would look:

[Diagram]

Black blocks the ko

Black looks pretty dead if he just connects to avoid the ko.

[Diagram]

Black allows the ko

In this case, black takes first in the ko, so white needs to have some really good ko threats to make this work.

[Diagram]

White plays b first.

Again, Black takes first, and white needs a very good ko threat. (W3 seems like it would only cause black to fill in the ko in which case, playing at c is no longer an option for white.)

Well, if this isn't the solution, I hope it's at least on the right track.


Malweth: Going with your last diagram, White does take ko first. If W4 instead elsewhere, B5 at W4 kills.

[Diagram]

W5 at 1.

unkx80: Sorry, but Zephi's solution is correct. In your diagram, B4 can connect, but W5 cannot play at a without putting himself into self-atari.


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