12 Jun
2006
12 Jun
'06
2:35 p.m.
I had a scarier experience just recently. Scientific American published a Domino sudoku by me, but the artist left out the domino placements. After looking at an issue in terror, I spent some hours trying to solve the puzzle as published. Fortunately, the puzzle was still solvable. In fact, it was a much improved puzzle, going back and forth between a domino tiling problem and a sudoku problem. Page 3 of of the following PDF gives the published and intended puzzle: http://sciam.com/media/pdf/sudoku_solutions_REV.pdf Ed Pegg Jr