Kruczek, Klay, and Eric Sundberg. “A Pairing Strategy for Tic-Tac-Toe on the Integer Lattice With Numerous Directions”. The Electronic Journal of Combinatorics 15, no. 1 (November 24, 2008): #N42. Accessed May 15, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v15i1n42.