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Answer Keima With Kosumi
Path: GoProverbs · Prev: TheEmptyTriangleIsBad · Next: CrosscutThenExtend
Difficulty: Beginner
Keywords: Proverb, Shape
This means to play kosumi (diagonal move) when your opponent plays a knight's approach move to your stone. Your kosumi will be on the point that the approach aimed at. It also aims at a shoulder hit (katatsuki) against your opponents stone. Take for example the following situation that often arises in a handicap game:
White approaches at 1 (keima in relation to black's corner stone). Next black plays at 2 answering a keima with kosumi. After w3 and b4 white will stabilize her group with a play around 'a'. Note that the aim of black 2 is not to secure territory in the corner. White can still invade at 'b' later on. Instead it denies W1 access to the corner, thus keeping this stone from easily securing a base - the white group remains weak. --ArnoHollosi, 1d BillSpight: Actually, B 2 is a kosumi-tsuke. I would have thought that answering keima with kosumi meant something like this:
But this, while joseki, is slow, and is usually avoided. The kosumi-tsuke is good to know, but also relies on the surroundings. You would not typically respond with either kosumi or kosumi-tsuke to a keima kakari. So how come this is a "proverb"? Aside from here, I have seen it only on Jan van der Steen's list, and did not find an explanation there. The other way around makes more sense:
B 2 is a keima response to the kosumi of W 1. That is joseki. Oct., 2001: The light dawns!
In this situation Black answers the keima of W 1 with the kosumi of B 2. This is a common joseki. (These days, B 2 is often omitted or delayed. There are other good options for Black, too.)
This is another common kosumi response to a keima.
But when White plays ogeima, the tobi is the usual response. (I learned this years ago. Frankly, I have forgotten why. ;-) Maybe somebody who knows can add an explanation for the difference in response.) 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 the ogeima with kosumi (both marked), later he can play B 1 - B 7.
If White protects with W 1, she threatens to jump in at 'a'. Note that Black had responded at 'a' instead of the kosumi (marked), he would still threaten to play at 'b', but White would not have a big threat after W 1. Path: GoProverbs · Prev: TheEmptyTriangleIsBad · Next: CrosscutThenExtend This is a copy of the living page "Answer Keima With Kosumi" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |