IgoHatsuyoRonProblem23/Solution

[Diagram]

White to play

First, White secures an eye in sente and cut off the Black group.

[Diagram]

Continued 1

B6 is the only defense to avoid an immediate ko.

[Diagram]

Continued 2

After reducing Black's liberties, W5!! is the climax.

[Diagram]

Continued 3: Ko

B8 recapture at black+circle, W9 at B4.

[Diagram]

Variation

Fujisawa, after adding some moves in the center, gives this line on "continued 2" and similar ko as above. But B8 at a wins the capturing race.


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