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== Snort == Snort, invented by [[Simon P. Norton]], uses a similar partisan assignment of two colors, but with the anticlassical constraint: neighboring regions are not allowed to be given different colors. Coloring the regions is explained as assigning fields to bulls and cows, where neighboring fields may not contain cattle of the opposite sex, lest they be distracted from their grazing. Deciding the outcome in Snort is [[PSPACE-complete]] on general graphs.<ref>{{cite arXiv|last1=Demaine|first1=Erik|last2=Hearn|first2=Robert|author2-link=Bob Hearn|title=Playing Games with Algorithms: Algorithmic Combinatorial Game Theory|eprint=cs/0106019v2|year=2001}}</ref> This is proven by reducing [[Kayles#Generalization to arbitrary graphs|partizan node Kayles]], which is PSPACE-complete, to a game of Snort.
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