A Lotta Lessons

6 4 3
A Q 9 3
A K J 9
Q 3
8 7 2 K 10
7 6 4 2 K J 10 8 5
10 4 8 7 6 5 3
J 10 9 7 2
A Q J 9 5
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Q 2 Opening Lead: 2 of hearts
A K 8 6 5 4 Vul: E-W

SouthWestNorthEast
1 Pass 2 Pass
3 Pass 3 NT Pass
6 Pass 6 Pass
7 Dbl All pass
This hand could well appear in Major over the Minor as well as No Trump Slams. But most glaringly without ambiguity, it belongs plump in the middle of this category: Preference. You bid two suits, and though your partner takes a sidetrack to 3 no, when he does hear you go to the 6 level in your second suit, he says, well, pard, I prefer spades. Taking him out of little slam to the grand, especially since you made a non-forcing bid with 6 clubs, is nervy enough. But to take him out of his preference bid to the suit he didn't prefer is outrageous. You've gotta trust his preference bid or why on earth offer two suits in the first place?
There's nothing to the play of the hand to discuss. You can see that the spade hook is on, but clubs split 4-1 and making 7 clubs is impossible. And 7 spades? Should North have taken his partner out? Well, the 7 club bid is such an outrageous bid in the first place after North had announced his preference, that I find it hard to blame North for letting it slide. But in any event, seven spades is a wrap. You sluff two clubs on the diamonds and one on the ace of hearts. Which is why 7 no makes also, and is by far the best contract.