[thorvald]

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Your partner, GIB lead ♣3 to the 9, and even knowing it is a short suit lead it looks right to use the K, but losing to the Ace.

Now declarer (Also GIB) enter dummy with a ♦ and plays a ♣ to the J (I am not sure what the idea of playing ♦ first is, but forget that), and continues with a ♣ to the Queen, and the last ♣ from dummy.

What will you discard?

On the actual layout there is 11 tricks, and your discard can't cost a trick, but you might fool GIB - or just let GIB get a bad simulation.

Have you made up your mind?

Spoiler

12 players
4 dropped a ♦, and GIB found all 11 tricks
7 dropped a ♠ and GIB tried to drop ♠K after finessing in ♠ first, so 10 tricks

1 clever player dropped a ♥, and now GIB dropped ♠Q from hand, and ended up not taking the ♠-finesse and thus not getting the last ♦, so only 9 tricks

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Perhaps my 14% for dropping a ♦ was well-deserved

[smerriman]

Yup, standard GIB; play different cards, get a different random number. No correlation between the play and heart/diamond discard, though I can see a spade affecting the probabilities.