General manoeuvres in bidding and play, and other choices of action in adapting one’s style to the peculiarities of a particular event or situation.
Different methods of scoring and conditions of contest often determine that you should modify your approach to the game. Tactics also extend to deciding which opponents to play against in a teams match and when each pair should sit out if there is a team of six.
For example, at matchpoint pairs you put more effort into trying to make overtricks than you would at other forms of the game; at IMPs, you push for vulnerable games more than you would at other forms of the game; at rubber bridge, you bid differently if you already have a part-score.