How would you play this? I don’t see that diagonal in the josekis on senseis, so is it weak for some reason?
A move is not studied when it’s considered inferior as other moves.
It doesn’t mean it is dumb it means it’s less efficient.
So you should compare with the classical answers (H11 keima,H10 tobi, L9 tsukenobi and pincers).
For example if white slides at M10 you get a more cramped position as if you had a stone at H11 instead
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I don’t know if you’re asking specifcally about a 13x13 board or not.
At least ordinarily, if white just plays the knights’ move
and you want to block the corner in the usual way with the 3-3, you’re going to wish that that diagonal move was further away for efficiency of making territory. If the diagonal was one space away (knights move) or two spaces away (large knights move) you’re going to be happier if that turns into territory that way instead.
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It’s not weak, it’s too strong. It’s overconcentrated and inefficient compared to going 1 line further away*. But as a plus it does make it harder to jump in and live at 3-3, so that option in response to a pincer is gone so White’s approach stone is a bit heavier so tenuki less appealing. So slide (which exposes the inefficiency because black doesn’t want to 3-3) or an extension along side makes sense next.
I recall Stanislaw Frejlak (now EGF 2p) played it before, probably for shits and giggles.
* long ago, even the small knight response to 4-4 was considered a bit overconcentrated, and large knight was preferred, I believe Go Seigen was one of the people responsible for popularising the small knight showing that being stronger made up for the slowness. But I think we’ve got the right balance with small-knight (Zero AI agrees) and a future Go Seigen isn’t going to make this kosumi popular. Takemiya did try with the diagonal towards centre at 5-5.
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Playing the kick (L9) first followed by the diagonal move is quite a decent move if the surrounding white is very strong. It reduces the severity of the 3-3 and also prevents white from playing the sliding move.
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Anyway if you like some more extensive joseki collection the largest are provided by Japanese publishers. You ll still have to be satisfied with using japanese language and check when it was published because of the many changes since 2016 (AI).
Commentaries are not a necessity but still enjoyable and interesting like when the Ishida (3 vol) was the reference in English.
A majority of teachers don’t recommend to spend too much time or to try some exhaustive reading, considering it as not so efficient before reaching some highest level in the kyu range.
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