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Puzzle Reviews by a Puzzle Writer: https://rjlipton.wordpress.com/2020/09/22/puzzle-reviews-by-a-puzzle-writer/

Lipton and Regan look at a few puzzles from the book "Bicycles or Unicycles: A Collection of Intriguing Mathematical Puzzles", by Velleman and Wagon, concentrating on one that places a pebble at the origin of the positive quadrant and asks to clear a 3x3 square by moves that replace a pebble by one above and one to its left.

The puzzle writer is Jason Rosenhouse, whose review of "Bicycles or Unicycles" is at https://www.ams.org/journals/notices/202009/rnoti-p1382.pdf