gumps

You are missing that partner should not open 1D on the hand you give! He should open 1C, planning to rebid 1NT after the expected 1S response by partner. I know that in real life the vast majority of 2/1 players open 1D, but I feel strongly that is bad bidding (a common result is playing diamonds in a 4-2 or 4-3 fit instead of clubs or NTs). Had the auction begun 1C-P-2C-P-3S*, then responder should take the bidding more cautiously because of the red suit losers and the likely wastage in trumps. On the actual auction, responder is entitled to expect that opener holds 5 diamonds most of the time. Andrew