In chess, a king can move to nay of the eight adjacent squares on the board - up, down, left, right, and the four diagonals. One can construct logological challenges by inserting letters on individual squares of a chessboard (extended, if necessary, beyond its 8x8 limits), and spelling out words by moving from letter to letter via king's moves.
Eckler, A. Ross
"King's-Move Word Packing,"
Word Ways: Vol. 27
, Article 23.
Available at: http://digitalcommons.butler.edu/wordways/vol27/iss2/23