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March 1999's Go Answer of the Month

Dia 1 - A recent game at West Surrey.

In a recent game at West Surrey, some White stones (not shown) were captured in the centre. Whilst this was happening White managed to build the group in the corner.
Status?

I was white, and I thought I could make the corner live, however I failed when Black attacked. Post game analysis showed that the situation is unsettled and that White needs another move to survive.

Dia 2 - Some key points.

Note that we have a potential gun nakade shape in the corner and that Black can throw in at to reduce white's eyespace.

The centre of the gun defines the vital point.

Dia 3 - A Black attack.

3 spoils the eye started with 2. 6 and 7 are miai. Capturing the three stones in the corner does nothing for white.

Dia 4 - A different White defence.

Here white aims for a seki, with a wide eyespace. However we have the bent four in the corner which leaves white dead. It is called bent four despite the fact that it is usually 3 stones (1, 5 and one at ) in a 5 point space!

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