under the direction of Philippe CRONIER Every day, at the bridge table, the declarants have colors to handle. And yet their sources of information are scarce. Of course, there are essential encyclopedias, but what should we remember? It is the object of this work to offer a presentation of reasoned principles which remain within the reach of all bridgers! And that they can put into practice! An introduction will encourage the reader to identify the objective to be achieved. Because, according to this objective, the handling can be different! The theory will follow: probabilities, handling of precaution, security, necessity, better luck ... But then, there will be practice! How to use the main principles? Numerous tests and 24 commented deals will allow the reader to apply the advice given to him by ... the best French bridge theorists.