I presume the ♦ spots were such that you could not confidently duck the first round into RHO's hand? Clearly he has to hold the ♦A or you would already be down. That would be a good idea at IMPs, but it does say that this was board-a-match. They're likely to be in 3NT at the other table, on the same auction, and there's a good chance of 10 tricks by getting one of the red-suits going. Also, it might be rather embarrassing if RHO has done something clever with J10xx xxx A10x AKx yep forgot conditions of contest and when I do that I drop into IMP mentality :)