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Y Y L No 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]
Diag.: Solution diagram 15

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


[Diagram]
Diag.: Diagram 1

If White 2 Black 3 ...


[Diagram]
Diag.: Diagram 2

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


[Diagram]
Diag.: Diagram 3

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


[Diagram]
Diag.: Diagram 4

This sequence makes miai of A and B.

--DieterVerhofstadt



Leon Matoh 5d points out:


[Diagram]
Diag.: 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 live.




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