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Teaching Game 67, Tsumego after W52
PageType: OngoingGame
Difficulty: Beginner
Keywords: Life & Death
This was the situation in the TeachingGame67 after W52 (the marked stone):
The white group on the RS is an example of a three-spaces notcher. But real-life Tsumego is complicated by the surrounding positions: fortunately this time, W has an ally in the LR group: a white move at c threatens to link up there with the sequence Wd, Be, Wf. Therefore W can work out a Ko this way:
Needless to say, this is a HanamiKo for black, i.e. he risks very little (also because he gets to capture first), while white risks a lot.
The sequence Joe believed could lead to a Seki is probably this one: JoeSeki Indeed it was what I thought was a seki. I saw the aji of "c" and thought that gave me enough time to either escape to the bottom or make a big enough room to get a seki.
This may look like a seki, but it is not: black has made an EyeInTheBelly? of white's group: she cannot capture those stones else she ends up with a space AlmostFilled with a dead shape, while black can always occupy all the external liberties, then play a and b to put the group in atari.
The problem of making life for this group could have been probably solved earlier by playing differently after I connected with the marked stone in the dia. below, by expanding the space starting at the other side:
This should be alive, but this sequence has the drawback of B2, that weakens the LR white corner. This is a copy of the living page "Teaching Game 67, Tsumego after W52" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |