The following randomly generated hand was played by people on BBO. About half the teams landed in 3NT-E, after a rather simple auction, yet every single one of these declarers failed to make it:
3NT is the only game West and East can make. The hand is amazing for how complex it is.
At first, it may seem that the hand is quite easy: 9 theoretical tricks with the ♣ finesse. But the hand requires a very careful balancing act.
Take ♦ tricks at the wrong times, and South can establish their long ♦ suit. Take ♥ tricks at the wrong times, and North can establish their ♥ suit. Lead ♠ too often, and there is no entry to West's hand
Almost all variations require West to lead ♣ towards East's ♣ at least once, and most variations need to use West's J♠ as a critical entry to West's hand.
Still other variations require endplaying North in ♣ or ♦. No matter the play, the key to making the contract is precise timing. One misstep, and the contract falls apart.

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