[Lord Molyb]

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Every west player was in 3♦. Nobody in the club is particularly an expert or a beginner.

At my table, a heart was led to the king and ace, and a heart was returned, which I ruffed. I led a high diamond and, upon winning the ace, north led a spade, letting me take the finesse for an overtrick.

This was a bottom board. Everyone else made 11 tricks in a diamond contract, but how can this be?

[manudude03]

There's a few ways, the most likely of them being a heart lead and after ducking from dummy, South popped the ace and returned another allowing you to throw the club away while also getting an entry to the table to finesse the spades.

Alternative ways include a club lead and south not expecting stiff king ducks, and initial spade lead to the Q-K-A and king of clubs ducked trying to prevent table getting in/setting up discards.

[whereagles]

11 tricks in diamonds??? well... I really can't see it.

[EricK]

Probably a ♣ to the ace followed by a ♠switch.