This variation, in which bumps against White's original approach stone, leads to very tough fights in which the surrounding context plays a significant role (That is, the whole board becomes part of the local, tactical issue whereas one should of course always take the whole board into account strategically when choosing a joseki).
There are three possible continuations for White, as shown by a database search on gobase's collection. These are a (downward atari), b (stretch) and more rarely c (sideways atari). We currently expose the main continuations only (a kind of widest path).
This widest is also the best solution according to Ishida's dictionary.
In the continuation, White takes the corner by playing 11 at a. Some comments:
at
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at
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at
Althought this variation features one of the more delicate tesuji, the tower stone tesuji I think it is called, it ends peacefully with both taking a small part of the corner and a couple of stones. Ishida calls this result inferior but playable.
In this variation, White allows for a very big Black corner, in exchange for sente and influence along the top. Ishida dismisses this variation, being resourceless. Yet it is found in pro games, probably because of the global conditions.
For a little discussion by BobMcGuigan and dnerra, see previous versions.