A player may also double any bid he thinks is unmakable. Doubling means that declarer's final score or penalty will be twice the normal value. Only the current highest bid can be doubled, and any new bid cancels the double. A player whose bid is still doubled at his next chance to bid may redouble, which will multiply his final score or penalty by 4. Any successive bid cancels both the double and the redouble.
Bidding ends when all three players pass.
The person who made the highest bid becomes declarer. The entire dummy is exposed and placed across from declarer. During the hand, declarer will play from the dummy just as if it were a fourth player sitting between his opponents. Any tricks won by the dummy hand count toward declarer's total. After seeing the dummy, declarer announces whether he will try to win or lose the number of tricks bid and names a trump suit or notrump.