6-4 point josekis
Work in progress
- a to c are viable ideas, d looks vulgar, e is an idea to transpose into the small avalanche.
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White's approach here gives a position that is characteristic of the 6-4 point, rather than a tenuki joseki. It is also by far the most common answer. Second most common is at a: others are not really seen in professional play.
Black b next is most usual and Black c is known. Black at d or e to pincer have been played by Yamashita Keigo and others.
This line has appeared in enough pro games to be recognisable as a joseki in the making. At the choice is between a and b.
If Black connects with , both players establish a position up to , after which Black can choose between , and tenuki.
With , Black opts for influence, granting White the corner. After , Black can play tenuki or play honte at a, a solid but slow move.
Note: The only games in my collection where is played are very old, from ~1940. This is not the case for the previous diagram, which seems to have been popular in China in the first half of the 1990s.
- This variation ( here): 3-4 point distant high approach, tenuki, inside contact
some lines given by kogo joseki and non-joseki database...
e.g. kitani minoru vs sekiyama riichi 1935-02-01
The 8 points white gets in gote is worth far less than the influence black gets.
tapir: btw. eidogo (i don't have access to some bigger database right now) has a game between choi cheolhan and lee seongjae featuring at 6-4, 5-3 but then black attaches on the second line :)
This way, it reverts to the small avalanche joseki.