4-5 10-3 enclosure

    Keywords: Opening, Joseki
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).


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

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.

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.

4-5 10-3 enclosure last edited by PJTraill on July 11, 2018 - 02:19
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