45103 enclosure

    Keywords: Opening, Joseki
[Diagram]

45103 enclosure

This formation occurred a couple of times in games between Honinbo Retsugen and Sakaguchi Sentoku I (each time the enclosure was Sakaguchi's).

[Diagram]

Trappy

The idea is to play into the complex joseki with B4, having black+circle waiting.

[Diagram]

3-3 invasion

In this case the 3-3 invasion by White gives Black a fair result. But Black at a would already look overconcentrated.

[Diagram]

Other way round (54103)



The other direction of extension is rarely used now - White can get a good result invading at W1, as you can see by applying the joseki in the previous diagram. In this case black+circle ends up on a silly point.

Go Seigen did try this a couple of times very early in his career.

Coming in at a is asking for trouble with Black b. White would want to live quickly and avoid the trappy variation.


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