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This contribution from Richard gives a useful insight into optimum scoring in "Pairs" The board is taken from the play on the 3rd June
Why are Greg & Richard in NT with a spade trump stack? Because if the trump suit is solid, and the hand with few trumps has no roughening values, then declarer would normally make as many tricks in NT as in spades - and you get the extra 10 points, which makes all the difference. Even 3NT+2 would have been good enough for a top.
(Greg and Richard would have bid this 1NT-2H-2S-3NT)