# Beginner Exercise 48 / Solution

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Solution.

puts a black stone in atari. The only defence for Black is to set up a ko at .

Variation 1.

If , White connects underneath at . Black is totally dead.

Variation 2.

Same as variation 1.

Variation 3.

prevents White from connecting to the exterior stones, but kills Black easily.

Jacob4Jesus: you say kills easily, but doesn't at a secure two eyes?

MrTenuki: No, because at a is self-atari (White will capture at b). Even if Black had an extra outside liberty (which would make at b impossible), White could still fill in at the circled spot to create a dead shape and keep the group dead.

fractic: captures a stone. Let's visualize it with a diagram.

Variation 3.

fractic: This is the position after .

Failure

allows to makes two eyes. There is no snapback at .

Continuation

EthrDemon?:Can't force a ko anyway as Black cannot connect at a?

MrTenuki: Nope, there is no ko here:

Continuation
Continuation

Black simply sacrifices the marked stone to live.

...and black is alive.

(In fact, playing out --- immediately would be wasting two ko threats.)

Beginner Exercise 48 / Solution last edited by stoned on December 17, 2011 - 06:35