RTG Problem 4 / Solution

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[Diagram]

Main line.

The placement at W1 is the tesuji; B2 offers the strongest resistence. However, W3 and W5 are clever plays, because B8 cannot connect at W9 because of a shortage of liberties. W9 takes away the second eye.

[Diagram]

Variation.

Black B2 tries to expand the eye space, but the hane at W3 destroys the possible eye at the corner. After W7, black dies from a straight three.


[Diagram]

Failure.

The simplest way of making ko is to hane at W1.

[Diagram]

Failure.

Black lives.

[Diagram]

Failure.

In the main line, if W3 extends into the corner, then B4 to B8 forces a seki.


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(OC) 2009 the Authors, published under the OpenContent License V1.0.
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