One of a Kind

by George Barany

This "mid-week level" puzzle was posted soon after learning of the passing of a long-time friend and colleague. Befitting the research interests of its subject, the puzzle contains some science. After completing the puzzle (spoiler), you may want to read more about its subject here.

Click here to view or download the puzzle in PDF format; here to download it as a puz file; here to download it as an ipuz file [requires the free Puzzazz app to solve]; here to solve the puzzle interactively (thanks to Jim Horne); here for the solution. I thank Michael Hanko, Martin Herbach, and Deane Morrison for beta testing.

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More puzzles here (all), here (science), and here (tributes).

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