Beginner Exercise 262 / Solution

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[Diagram]

Solution

This is essentially a simple exercise on finding the space to make an eye. After B3, a and b are miai, and c and d are also miai, so Black lives.

(For advanced readers: The exchange of B1 and W2 is meaningful to erase a pair of mutual ko threats which is far larger for White. This also makes White's ko threat at e smaller. Of course, White may play elsewhere after B1.)

[Diagram]

Comparison

Immediate B1 also lives, but gives Black two more ko threats to kill (W2 and W4).



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