Beginner Exercise 13 / Solution

Sub-page of BeginnerExercise13

Solution by lavalyn 17k:

[Diagram]

It's easiest to make eyes in the corner

Black B1 takes the corner for eye space. Now the best White can do is to minimize the eye space available, but the available space is sufficient to ensure life.

[Diagram]

Full diagram


For your viewing pleasure, some failure diagrams:

[Diagram]

Extending in the wrong direction

Black, in his attempt to take more of the side, loses after W2 and W4: on the second line, six die but eight live.


For your further viewing pleasure, some not so minor changes to the problem (by Sergio) :

[Diagram]

Black is dead

If the WC stone is on the second line (instead of the third) Black is dead...

But what should White play in answer to a ?

[Diagram]

Killing move

Even if it's not a clear move to beginners W1 is the only one that kills.

Deebster: Doesn't b kill Black too?

unkx80: Yes, b kills too.

[Diagram]

White kills

If Black plays at a, White kills by the throw-in at W3.

[Diagram]

White kills 2

If Black attempts to capture with B2, White plays W3 to prevent an eye at W1. If Black captures at B4, White plays at W5, the vital point of the remaining straight three.

[Diagram]

White kills 3

But what if Black plays B4? White plays W5 to take away the last chance for an eye. Capture B2 any time to kill the group.

So we can conclude that in the original problem, Black's threat of escape along the second row is necessary for survival. With WC present, that threat disappears, and White can hane with impunity.


[Diagram]

what about this 1?

fred : would Black live with B1? And is the rest realistic?

Charles No, W2 should be at B7.

k, i get it



This is a copy of the living page "Beginner Exercise 13 / Solution" at Sensei's Library.
(OC) 2005 the Authors, published under the OpenContent License V1.0.
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