One way to make would be via 4 trumps, 2 ♣ruffs, 1 ♥ and 3♦. But to enjoy the long♦ is unlikely, because this requires that trumps are drawn already. Even if ♦ are 3-3 and trumps 2-2, opponents will be able to play yet another ♣ when in with the ♦A and dummy will be left with ♠Q10 with the K still out. Or, if a trump is played to the Ace, trump to the Queen, opps get in with the trump King, and play a ♣. Then they duck the ♦A till the third round and dummy has no entry. You need trumps to be 2-2 in order to make. You can try for ten tricks by way of 3 ♣ ruffs, 2 ♦ tricks, 1 ♥ tricks and 4♠ tricks (♠ must splt 2-2) Because a trump promotion is more possible in ♥ than in ♦, you should try to get to the ♦Q rather than the ♥A at trick 2.