RTG Problem 25 / Solution

Sub-page of RTGProblem25
[Diagram]

Solution

Black needs to make an eye on the left edge in sente, and then proceed to make the other eye near the center. So the descent at W1 is the important first move, followed by making the second eye at W3.

[Diagram]

Failure

The hane at W1 is wrong. Black can make a thow-in at B2 before returning to win the capturing race at B4. So there is only half an eye on the left edge, and White dies.

[Diagram]

Failure

Making the eye at the upper side at W1 first is wrong, because B2 and B4 can destroy the other eye. Most likely the mistake made by W1 here is assuming that B2 will play at B4, so W3 can live again by playing at B2...


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