Each players bid a number of tricks between 0 and 13. Each team adds the bids of the two partners together and the total is the number of tricks that the partners try to win to get positive score.
The bidding begins with the player to dealer's left and continues clockwise. There is no requirement for each bid to be higher than the last one.
A bid of 0 tricks is known as NIL. Players who select 0 (Nil) bid declares that they will not win any tricks during that round. If the player fails to achieve 0 (Nil) bid, it brings -100 penalty points. If it’s successfully achieved, it will bring +100 points as bonus.
At the beginning of the Bidding, players can make BLIND NIL bid which must be declared before a player looks at his cards. Blind Nil may get you +200 points or lose you -200 points