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(No. 131: Oct. 26, 1998)



Elementary level: Answer

Black 1 is the vital point. If White 2, Black 3 kills White.
If White 2 at 3, Black 2 kills White.





Elementary level: Wrong Answer 1

Black 1 is wrong. After White 2, Black 3 cannot kill White.
White lives with 4. If Black 3 at 4, White lives with 3.





Elementary level: Wrong Answer 2

Black 1 allows White to play at the vital point 2 and live.






Intermediate level: Answer

Black 1 is the vital point. If White 2, Black plays
3 and 5 to capture the two White stones in a Snapback.
White dies.





Intermediate level: Variation

If White 2, Black plays 3 to 7. White is dead.





Intermediate level: Wrong Answer

Black 1 allows White to play at the vital point 2 and live.






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