“Bet Double” can only be used after the enemy bids. In the simplest terms, this means that the player is very confident that the enemy’s contract cannot be completed, so the player is willing to bet that their score will be doubled if the contract is defeated, but their score will also be doubled if the enemy completes the contract. Double your bet. But in modern bridge, bet double is often used as a special treaty, asking the partner to bid, or sending a message to the partner.(引文)
The competition consists of two parts: bidding (also called bidding) and playing cards, and then the cards are scored. After the “contract” is decided, the bidding ends. The contract represents a pair declaring the minimum number of dice that one of their sides must take, as well as the specific suit that will be used as a trump (or not use a trump). The rules of playing cards are similar to other card-winning games, and one player’s hand must be placed face up on the table, called “Dream House.”(引文)