Noseki 2
Here
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.
This mistake is probably caused by the vague memory of a simliar 3-4 joseki.
So what's different here?
White may play
in the first diagram expecting Black to make a two-point extension
here; as in a typical continuation of the 3-4 point joseki.
However, Black probably wouldn't do that, because the two-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.
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
lightly, and build an outside position.
![[Diagram]](../../diagrams/24/7f565cdf9bc93b27983b488833d755c4.png)
![[Diagram]](../../diagrams/52/bdc2ad4b7b1eb147440967af66b5ec5f.png)
![[Diagram]](../../diagrams/4/a9f03b965e33d1bc6ec285ff2ee71cd6.png)
![[Diagram]](../../diagrams/13/f7ecffc9b1dc291af923b450aab07e64.png)
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