Declarer swiftly drew trump and claimed thirteen tricks, NS +1460.
South could easily launch into Blackwood since the auction marked partner with a singleton spade. When North revealed two controls without the heart queen, he advanced to the major suit slam. He naturally assumed that the ace of spades was missing but the display of the dummy put that assumption to rest. The heart suit was agreed as the trump suit by inference since North had offered a support double disclosing three-card heart support.
The defense earns one trick when West begins with the club ace but West could not be expected to lead that suit when partner had raised spades. The minor suit slam would come to grief if East begins with the queen of clubs. Of course, he might indeed choose a spade but +1390 does not favorably compare with the actual result (+1460). Bidding the major suit slam had right-sided the contract and could not be defeated. Ironically, South had advanced to the heart slam because it was the higher scoring contract and there was a known eightcard fit.