If the declaring side takes at least the number of tricks bid, then they score the number of tricks they have, otherwise, the bid is subtracted from their score and the opposing team scores the number of tricks they collected themselves.
This rule describes how points are awarded in a bidding game where the declaring side must win at least the number of tricks they bid to earn points. If they fail to do so, their score is penalized. The opposing team then gains the points for the tricks they successfully won.