Beginner Exercise 80 / Solution

Sub-page of BeginnerExercise80

B1 forces White to play W2 (else Black gets his second eye by playing at W2). Then Black captures White's stones in oiotoshi with B3 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. B3 at either "a" points is a gote necessity.

Bill: After B3 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 B1.

ProtoDeuteric: How would White capture B1 after a B3 at either "a" point?

JG White cannot capture B1 after B3 at "a". Bill means that White should capture B1 in the first diagram.

Bill: I meant, instead of connecting.

Ko threat left for White  

After B3, white has a ko threat at a

Nothing left to do locally  

After this sequence, White has nothing more locally.

Beginner Exercise 80 / Solution last edited by MrTenuki on May 13, 2009 - 19:47
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