each player may place their dominoes in either orientation. It seems only a small variation in the rules, but it results in a completely different game that can be analyzed with the Sprague–Grundy theorem. See also Blockbusting (game) A combinatorial game whose analysis has been applied to Domineering. References External links Playable version at Pencil and Paper Games Abstract strategy games Mathematical games Combinatorial game theory Paper-and-pencil games