The consensus was that North's three-heart bid was the cause of getting to a grand slam that required taking the right finesse and getting some good breaks. Rap�e didn't want to get to seven, but by the time the auction reached six clubs Sidney Lazard had not supported his partner's hearts.
Mathematically, the diamond finesse seemed to offer the simplest chance. If it succeeded. South could trump a third diamond, and any reasonable spade break would let him take three heart discards from his hand, making the heart finesse unnecessary. But the diamond finesse lost. The heart finesse would have won. West would have been unable to guard the heart suit and the diamond king as well, so that if South had guessed the situation he could have made all the tricks.
At the other table Ira Rubin and Curtis Smith stopped at six clubs and made it for a swing of 970 points—13 IMPs.