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keima slide and ogeima slide
Difficulty: Dan level
Keywords: Shape
Discussion originally on answer keima with kosumi.
This is another common diagonal response, to a keima slide.
But when I learned this years ago. Frankly, I have forgotten why. Yesterday I saw Prof. Teigo Nakamura 6-dan. He has the most encyclopedic go knowledge of any amateur I know. He had forgotten why, too. ;-) But he spent a few minutes playing with the position and came up with the answer.
If Black answers
If White protects with (Moved from answer keima with kosumi.) Charles Matthews I have wondered about this, having seen something very similar in an old Japanese book on tesuji.[1] Firstly, there is no 'shape-based' rule.
If one looks at this sort of pattern, just somewhere on the side, then Black a and Black b are both commonly seen. If one specialises to the case of the small high enclosure, then the diagonal move answer is more popular:
These come from database search: they may contradict the book I read. Looking, as one should, into the game context, the diagonal move answers do seem to be in the type of position where Black wants to take sente.
There may be something in the idea that the one-point jump answer
In the keima slide case, White's immediate cut with [1] A 1955 book by Kano Yoshinori. Here are the actual positions.
This is a copy of the living page "keima slide and ogeima slide" at Sensei's Library. ![]() |