On a 7 x 7 chessboard, a knight moves from the central square in the bottom row to the central square in the top two row in four jumps. There are a number of different routes it can take, and in his article "Three Jog Knight" in the August Word Ways, Harold Jacobs wondered whether readers could mentally envision the composite network formed by all of these routes without having to draw a picture of it.
"Two Knights A-Jog,"
Word Ways: Vol. 41
, Article 5.
Available at: http://digitalcommons.butler.edu/wordways/vol41/iss4/5