Source:
Problem diagram.
White plays.
Side variation analysis:
Myron Souris
Solution follows
(or click here to download SGF)
Correct.
White 1 is a clever preparation move.
Black 2 looks promising.
Normally White 3 fails to connect, but here White's 1st stone make the difference.
White 5 and 7 just barely make the connection along the top edge.
See the SGF for even more variations than the ones shown below.
Black variation.
Black 2 here also fails.
After 7, White still connects.
Black variation.
Black doesn't have time to extend toward the edge with 2.
White 3 turns the tables.
Now Black is the one whose group is cut off.
Black will run out of freedoms before White does.
Failure.
White 1 is bad timing.
Now Black's standard clamp tesuji works with moves 2 and 4.
After Black 6, White has failed to connect.
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