Beginner Exercise 80 / Solution

Solution  

forces White to play (else Black gets his second eye by playing at ). Then Black captures White's stones in oiotoshi with and lives. See also Connect-and-die pyramid four gives one eye in gote.

-- Nando

White knows about oiotoshi  

ProtoDeuteric: If white knows about the impending oiotoshi, she would probably connect out so that she loses fewer stones, as well as having more time to play elsewhere on the board that is more important. at either "a" points is a gote necessity.

Bill: After in this diagram White has no ko threat. In the first diagram she has one. Since the net score is the same, White should capture .

ProtoDeuteric: How would White capture after a at either "a" point?

JG White cannot capture after at "a". Bill means that White should capture in the first diagram.

Bill: I meant, instead of connecting.

Ko threat left for White  

After , white has a ko threat at a

Nothing left to do locally  

After this sequence, White has nothing more locally.

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