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December 2005's Go Answer of the Month

Dia 1 White to kill.

I think I've seen this problem before - but I can't recall where. Anyway this version was found "lying around" on a board at the Tampere tournament in Finland in November 2005. White to kill - or show the shape unkillable.

Dia 2 The marked stone makes a difference.

I'm not 100% sure, but I believe that the problem as stated is "White can kill, Black can live". If the marked stone is missing, I think (unproven) that Black is alive.

Anyway, a selection of failures to kill...

Dia 3 White fails to kill - A.

8 at 5.

Dia 4 White fails to kill - B.

Dia 5 White fails to kill - C.

Dia 6 White fails to kill - D.

Dia 7 White fails to kill - E.

Dia 8 And a killing sequence for white.

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