Do you have any bridge pet peeves? One of mine is this: Partner opens 1NT and you have a balanced 9 high-card points. You raise to 2NT, right? Well, I do, but most players use 2NT for something else, so have to start with Stayman.
What's so bad about that?
1. You reveal the 1NT bidder's hand, and
2. You give them a chance to double Stayman or make a cheap overcall
Suppose it goes 1NT on your right, 2NT on your left and 3NT on your right. What do you lead holding:
♠K J 9 7 2 ♥J 10 6 3 ♦Q 9 ♣Q 8?
I held this hand playing with Kate in a Speedball Pairs on BBO tonight. The opponents went through Stayman and the 1NT opener showed a four-card spade suit.
It wasn't too hard to avoid the spade lead. Setting 3NT was worth 7.61 IMPs.
Raising 1NT to 2NT occurs frequently. Make that natural and figure out some other way to bid your diamond suit.