One-cheek rule:
> The following rules are sanctioned by the National Crokinole Association and used in all NCA Tour events.
> (…)
> 7. i) When a player is shooting, at least one portion of his/her posterior must be in contact with the seat of his/her chair.
http://nationalcrokinoleassociation.com/resources/rules.html
What advantage could one get by not having any cheeks in contact with the chair?
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