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Solution To Question Mark Problem 1
  Difficulty: Advanced   Keywords: Problem, Tesuji, Life & Death

[Diagram]
Diag.: Black can kill

Black can kill and the point to start the attack is the obvious a.


[Diagram]
Diag.: Main line

When White ataris at 4, Black faces the choice of connecting at the marked stone or connecting at a.



1. Correct solution: under the stones tesuji

[Diagram]
Diag.: Correct solution

Connecting at 5 is correct. After White captures at 6 ...


[Diagram]
Diag.: White is dead

... she is left with a bulky five shape and Black 7 kills her right away. This is a nice example of playing under the stones.


[Diagram]
Diag.: Shape

The important thing to see in this shape is the "hidden" bulky five shape of the marked stones.



2. Failure: ko

[Diagram]
Diag.: Failure

When Black connects at 5 he allows White to make a twisted four in the corner eyeshape.


[Diagram]
Diag.: Ko

Nevertheless, Black can get a ko out of it by playing as shown.



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