XuanxuanQijingProblem67/Solution

[Diagram]

Main Line

Black B1 to B3 sequence is apparent.
B5 is a tesuji.

[Diagram]

continued - seki

This line results in seki life for Black with no points.

[Diagram]

Variation

For W4 here, B5 is still a tesuji. Black can live with double ko with points. (This gives White infinite number of ko threats for other ko fights and is sometimes better than the above seki where only White must worry about seki-collapse.)

[Diagram]

Failure

Black B5 is a bad move. It leads to simple death.


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