The interesting bid is the jump to 2NT to show a balanced hand worth 18 to 19 points.This is an excellent bid with that long solid minor suit. With at least a doubleton heart opposite North jumped to 6H, and South continued his good bidding by converting to 6NT, as he feared an opening lead through the ♣K, and thought with his small heart doubleton there could be a trump loser. After the  ♣A is led followed by another club, how should the hand be played? If the diamonds are coming in, the hand is very easy, but good declarers should assume they will not be. Is there an extra chance without taking any serious risk?.Well there is if the ♥Q was to fall. But it appears it doesn't!

The correct way to play the hand is first to cash all of the spades, with South discarding a diamond on the fourth spade. There is nothing to lose from this line and everything to gain, as the noose tightens around East's neck. He has to find 3 discards, and they can only be the remaining two clubs and a heart. Now cash ♥AK and the magic happens. Down comes the ♥Q and the contract is a certainty. If the ♥Q had not fallen South would then fall back on the very likely favourable break in the diamond suit. The same line could be taken after a spade lead, by quickly forcing out the ♣A. If West ducks the ♣A the play gets more interesting. But is West really going to duck the ♣A, when the ♣K is played at trick 2?  If he does, what an excellent defence. But South will still prevail as when the spades are all run, East will need to get rid of all his remaining 3 clubs and he is now wide open to a throw in.This type of play comes up quite often in no trumps, when there is a running suit which puts pressure on the defender's discards.

Not one pair bid and made 6NT and it is not so difficult if one thinks about the extra chance!