Its matchpoints and you play in 3N:
1. ♥T, x, T, Q
2. ♦K, A, 6, 3
3. ♠2....
Lets pretend you have a mild brain hemorrhage, forget to count your tricks and try the ♠T. This draws the King and a low heart is returned.
Assuming LHO won't have the ♦A + ♥K + ♣A for the WJO, can you see your way back to nine tricks?
Are there variations?