It is true that we can know the partnership number of controls but setting trump has some other advantages doesn't it? Or am I missing something? Playing Precision 1♣ opener is captain. Therefore you dont set trump, captain decides the contract. How can I ask about the trump Q? Ordinary way or look into Power Precision OK I was not clear. How does opener set trump after (for example) 1C 3D big; 4144 or 4414 2-3 controls fewer than 13 HCP 3H 3S shortness?; Diamond shortness So if opener now bids 4M that is to play. So my question is how does opener set trump and still be sure to get another bid?