The defense swiftly cashed three heart tricks but South could claim the balance, N-S +630. Declarer would romp home with thirteen tricks when West begins with a club or twelve if he selects a spade or a diamond.
The auction disclosed that North was 5-5 in the majors and South was reluctant to advance beyond 3NT on this apparent misfit. North was content to play in the nine-trick game since it was clear that partner did not own three-card support for either major. He could have bid out his pattern by continuing with four diamonds but declined this action because he owned but 12 HCP. In this scenario, South would launch into Blackwood to ask for controls and settle into six diamonds when the reply reveals two controls without the diamond queen. A diamond slam is icy because trump divide 3-2 and the opponents can cash but one heart trick. West may begin with a trump but South would play off the queen and ace, unblock the queen-jack of spades and lead a diamond to the king extracting the last trump. He would score five diamonds, five spades and the top clubs to earn the slam bonus.