Beginner Exercise 259 / Solution

This position was adapted from a position that appeared in a professional game. This game was described in the book 《实战的魔术》 (ISBN: 7-5337-0567-2) by Yamabe Toshiro.　(Original Japanese edition: 実戦の魔術, ISBN：9784818201965)

Solution  

and can force a ko for life. Black has some ko-threats in the vicinity of a.

Variation  

If destroys the eye at the bottom, then and captures six White stones.

Local ko-threat  

Later, White has a local ko-threat at .

Solution  

White should have played the atari at before defending the cutting points at .

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