NORTH ♠️: KJ10986 ♥: QJ9 ♦️: K ♣️: Q106 WEST (Dlr) EAST ♠️: 75 ♠️: Q43 ♥: AK7642 ♥: 1083 ♦️: 8762 ♦️: 54 ♣️: 8 ♣️: A9752 SOUTH ♠️: A2 ♥: 5 ♦️: AQJ1093 ♣️: KJ43
Or, for those desiring accessibility assists;
(S, H, D, C)
W: 75 AK7642 8762 8
N: KJ10986 QJ9 K Q106
E: Q43 1083 54 A9752
S: A2 5 AQJ1093 KJ43
W opens bidding with 2H which usually shows 6-10 points and 6+ hearts and then N/S bid to game in 3NT.
East leads [to West's] A then K of hearts and exits on a 3rd heart. You can guarantee the contract by making the Q of hearts, A & K of spades, and 6 diamonds. However you can make +1 by giving up the A of clubs early. The only danger in doing this would be if West turned up the A of clubs and ran the rest of their hearts.
Giving the bidding you should be safe to assume East has the A of clubs since if West had it they would have to have 11+ points. If you played to this assumption to make +1 (important for match points) and West did turn up with the A of clubs making the contract go down then is there anything you can do? Would you need to have asked what their preempt means during the bidding?