I like 2♦. Partner won't be able to evaluate well over a spade rebid since I have this unexpected shape, and it leaves room in case he wants to bid 2♥. If partner passes I think I have lost some equity but it can still easily be right (or at least fine).
"What's the big rebid problem? After 1♦ - 1♠, I can rebid 1NT, 2♠, or 2♦."
- billw55
2♦. If I was going to bid spades it would be 3♠ and on the hands where partner passes 2♦ he would likely also pass 3♠, so I would have to take two tricks more in spades than diamonds, opposite a spade shortage. The upside of 2♦ comes when we belong in diamonds or hearts, or partner is able to evaluate better over my eventual 3♠ bid.
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Posted 2012-October-07, 22:45
2♦. Over 2NT I will bid 3♥ in case he has five. Over 2♠ (5-7 3-card raise or 2 cards) I will bid 3♠. Over 2♥ I will bid 3♥. These all show around 15-17[-] TP which I sort of have. If he passes 2♦ he probably has 5-8 HCP with 4-5 diamonds (and not two good spades) so it is porbably a good contract. There might be a very few hands he could pass 2♦ with that will make 4♠ but not enough for me to worry about.