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YYLNo Erratum Here 1
   

This page contains a discussion on problem 15 in Yang Yilun's Ingenious life and death puzzles, Volume 1. I thought it contained an error, but Leon Matoh gently pointed out my mistake.

--DieterVerhofstadt


On page 31, solution diagram 15 mentions:

[Diagram]
Solution diagram 15

"If Black 1 at 5, White (2 at) 6 is sente. Next, White can play 3 to live."


[Diagram]
Diagram 1

If White 2 Black 3 ...


[Diagram]
Diagram 2

White 4 is a mistake : Black 5 makes miai of a and b to kill.


[Diagram]
Diagram 3

If White plays atari at 4, Black 5 reverts to the original solution diagram.


[Diagram]
Diagram 4

This sequence makes miai of a and b.

--DieterVerhofstadt



Leon Matoh 5d points out:

[Diagram]
Diagram 5

If Black prevents White from making a second eye at 9, then White 10 makes miai of a and b, capturing some stones and living.





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