You are in 3NT (scoring is match-points). North over-called 2D in the second round but leads the 2 of spades. South can not beat the 9 of spades that you play from dummy. How do you play?
I got mesmerized by dummy's heart suit, and ducked a heart when north went up with the 10 of hearts on the first round. Hearts didn't break 3-3 and then I lost track of the hand. I can still make if I guess the clubs right. But there was a simpler line, obvious in retrospect if I'd inferred north's hand. He has 4 spades (lead) and 5 diamonds (bid). He has 10 points (Ace spades, A-Q diamonds). He probably has 2-2 in hearts and clubs and should not have any other honors.
Now, it is easy to count my tricks and keep south off lead. I have three spade tricks, two hearts and three clubs. The club suit (not the hearts) is the best place to get the ninth trick. I should lead a club to dummy and finesse on the way back. Even if it happens to lose, the contract is now cold. The complete hand. North had only 4 diamonds, but the line would have still worked.