Beginner Exercise 85 / Solution

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[Diagram]

The toughest resistance from Black

B2 must be answered by W3 - and certainly not W4 or W5. One suffers from shortage of liberties, and the other leaves Black with B3.

[Diagram]

Variation

If B2 here, W3 is the only play that secures life.


[Diagram]

Failure 1

W1 looks like making two eyes, but due to the descent at black+circle, Black can play B2. Now White can only live by a ko at W3.

Note that W3 at a is wrong - see below.

[Diagram]

Failure 2

If W1 here, then B2 hits the critical spot, and White is dead.

[Diagram]

Double ko death

If White throws in with W1, B2 takes one of the kos. Now if White plays at a or b, Black fills with black+circle, holding White to one eye.

[Diagram]

Double ko death (ii)

If White later takes the ko back with W5, B6 takes the other ko. Now if white+square, black+circle kills.


lavalyn, Dansc, Bill Spight, unkx80.



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