Rubber bridge they must play a card of the suit led if they have one. A player who has no cards of the suit led may play any card either discarding or trumping. A trick is won by the highest card of the suit led unless trumps are played, when the highest trump wins. The winner of the trick leads to the next trick. The main article includes a detailed description of rubber bridge scoring with examples. Essentially, each winning bid's value is scored "below the line" (e.g., 3 Spades nets 90 points below the line) and overtricks, bonuses, etc. are scored
Vickrey auction is dominated by the strategy of truthfully bidding. The strategy of underbidding is dominated by bidding truthfully. Assume that bidder i bids formula_8. If formula_9 then the bidder would lose the item with a truthful bid as well as an underbid, so the strategies have equal payoffs for this case. If formula_10 then the bidder would win the item either way so the strategies have equal payoffs in this case. If formula_11 then only the strategy of truthfully bidding would win the auction. The payoff for the truthful strategy would be positive as they paid less than their value of