You don't always have an obvious cal by Bobby Wolff

A: 3♦: It looks straightforward to bid three no-trump here, but your partner might have a singleton spade, in which case slam in clubs might make while three no-trump goes down. Temporize with three diamonds and find out more about your partner's hand.

Your result so far:

A: 2♠: The takeout doubler is in direct seat, not balancing seat, so his call guarantees a better hand than it would in that auction. (A balancing double starts a king lower in the protective seat.) So you should drive to game now; either cue-bid two spades or just jump to four hearts.

Your result so far:

A: 1NT: If North were an unpassed hand, his one-heart call would be forcing. You would bid one no-trump now, both to try to improve the strain and to avoid missing out on game. Facing a passed partner, I might pass one heart if the call guaranteed a five-card suit, but I'm not sure it does. I'd still bid one no-trump here, though less happily.

Your result so far:

A: 2♦: At matchpoints, you might consider playing hearts rather than diamonds. But at IMPs, you simply want to go plus by making your natural call: raise diamonds. If the opponents compete in a black suit, you can bid on to three diamonds, which will most likely end the auction.

Your result so far:

A: 1♦: You don't want to pass and hear partner run to one spade, which he might do with, for example, a 4-3-3-3 shape; so it seems right to bid either one diamond or one heart. I would start by bidding one diamond, and if the opponents doubled enthusiastically, I'd run to one heart.

Your result so far: