E-W can make 12 tricks in hearts, spades or NT, but only 3 pairs reached the slam. At the table above Balázs Kotányi played 3NT and managed to get all the tricks by squeezing North. However, László Marcin could have avoided his fate, if he had led a diamond honor instead of a small diamond. After leading a small one his partner had to play the jack in the first round, and he was stuck with the sole guard of both minors.
Here is another interesting situation, after the seven of diamonds lead, how do you plan to make 3NT, which card would you play from dummy?