“On Yang’s puzzle (12/10 Member’s Edition), did you mean white to play instead of black to play?” wonders Eric Osman.
You are correct; sharp find! Sorry about that. We’ve updated the problem, so if you reload the tsumego problem link, you should see the correction.

via American Go E-Journal http://www.usgo.org/news/2013/12/your-movereaders-write-yang-problem-correction/