Lead: low heart, result: Contract made.
These are obviously world class players, but I found this board fascinating. Firstly I don't get Klukowski's bidding, why not bid 3S rather than 4D if you're going to ram it into slam anyway? And 6C seems very ambitious with only a low doubleton club and a likely heart loser.
And Bessis' lead of a low heart ... again I don't get it, surely the Ace is a favourite to stand up given no heart cue from opponents, and surely it's better to hope there's some trick elsewhere for the set rather than I'm guessing hoping Klukowski had KJ and Gawrys xx and put them to an early guess?
Anyway I just thought this was an interesting board!
edit: Not sure how to put the names in the diagram but to clarify NS was Lorenzini N and Bessis S, EW was Gawrys E, Klukowski W