Ann won the spade lead in dummy and ran the eight of clubs to West's ten. West defended accurately by returning a trump. After drawing trumps, West won the first round of diamonds and when both defenders kept their clubs there was no way home.
The hand record showed that ten tricks could always be made, but we had to put the deal into Deep Finesse to find the winning line. The key play, not at all obvious, is to ruff a spade at trick two, and eventually West can be endplayed to concede a second club trick. You can follow the play by clicking Next on the diagram. Four hearts was the contract at 11 of the 16 tables, but was only defeated twice. I would be willing to bet that the other declarers succeeded due to a friendly defence rather than finding the double dummy line.