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Bridge Conventions (List) Defense to opponents' 2 and 3 level preempt bids.
Double is for penalty
cheapest possible suit overcall is equivalent to takeout
Fishbein Defense
A bidding convention is an agreement between two players on a different meaning of a bid in the card game bridge. These agreements are made so that partners can more quickly determine which contract, with both their cards, they can win together. Often, conventions are forged together into one, which is then called a bidding system.
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