RTG Problem 51 / Solution

Sub-page of RTGProblem51

Solution

[Diagram]

Throw-in

White starts by throwing in a stone at W1. Black has no choice but to capture.

[Diagram]

Throw-in again

With W3 white plays another throw-in, again forcing black to capture.

[Diagram]

Ko

After W5, it is an approach ko, with white taking first.

Note that Black no longer threatens to kill, she only threatens to make a direct ko, so the local temperature has dropped.


Failure

[Diagram]

Failure

If white does not play the throw-ins first, but give atari on the ouside, she will be short of liberties after B4 and unable to approach.

[Diagram]

Failure

W1 does not work either, as B2 can prevent white from capturing the three Black stones. (Actually, in this problem, B2 can also choose to play at a and allow White to capture the three Black stones, as Black gets only one eye this way.)


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