Scoring: IMP
It seems to me that declarer can take 3 more tricks by playing the ♦3 to the ace, the ♦4 to the ten, forcing North to lead ♥. (This was a findable play, as the distribution was marked and North had overcalled 1NT with only the ♥A and the ♦Q!) But GIB says the contract is unmakeable. Do I need to finish my coffee?

Help
