That's not always true. Sometimes you suspect that declarer can claim, but you're not 100% sure. However you are right that a defender shouldn't have to tell declarer to claim, since declarer should claim whenever he can. Btw, sometimes if you concede all tricks, declarer declines and just plays every card until the very end while they're all winners. That's a clear violation of the rules, but that doesn't get punished. Imo it would be a lot better if some declarers weren't so childish. If defenders want to draw declarer's attention to the fact that they can claim, they can also be thankful that they can play more hands in the same amount of time. That's what you can call "positive thinking"... :rolleyes: I suppose there is some good reason why declarer is allowed to decline a concession of the rest of the tricks instead of just happening automatically but I am at a loss to think of one.