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Noseki

 

Noseki 2
    Keywords: Ko

[Diagram]
Noseki

White W4 is not joseki. It is more normal to invade at 'a' or make a double approach at 'b'. The ikken tobi at 'c' starts the possibly deprecated Catenaccio Joseki.


[Diagram]
Joseki

This mistake is probably caused by the vague memory of a simliar 3-4 joseki.

So what's different here?


[Diagram]
Noseki

White may play W4 in the first diagram expecting black to make a two-point extension B5 here as in a typical continuation of the 3-4 point joseki. However, black probably wouldn't do this, because the 2-point extension on the fourth line doesn't have the same meaning as it would in the 3-4 point joseki---it doesn't secure territory. Black may instead choose to seal white in with 'a'.


[Diagram]
Moves 20 to 28

The only game I could find with this jump was this one, played by Pak Seung-hyeon as white against Yi-Setol in the 2001 Baduk TV Cup. Here the idea of the jump seems to be to treat the marked white stone lightly and build an outside position.



This is a copy of the living page "Noseki 2" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.