What partial orders on suits are used in games?
Total orderings are common, though there are a lot of disagreements. In poker (when it's needed) and bridge (when bidding) the ranking is clubs < diamonds < hearts < spades. In 500 bidding it's usually spades < clubs < diamonds < hearts.
Trick-taking games switch to a partial order in each trick, where the lead suit ranks above two suits, but below a trump suit.
Are there any games that exhibit the diamond partial order? Or other idiosyncratic orders?