Professor Knuth supplied these three unusual puzzles that he had handed out to participants at the International Puzzle Party (IPP) held at San Francisco in August 2009. He dedicates the puzzles to the memory of Nob Yoshigahara. Solution will be provided in the next issue.
"Latin Square Word Puzzles,"
Word Ways: Vol. 42
, Article 4.
Available at: http://digitalcommons.butler.edu/wordways/vol42/iss4/4