By George Barany and Daniel Silversmith
George Barany is a Rockefeller alum (1977) who currently lives in the Twin Cities, Minnesota, where he has known Daniel Silversmith, a practicing clinical psychologist, since 1999. For more about this specific puzzle, including a link to the answer, visit http://tinyurl.com/checkerspuz. More Barany and Friends crosswords are at http://tinyurl.com/gbpuzzle.