bridge
South won the first spade and drove out the ace of clubs to record seven tricks, N-S +90. South could not venture 1NT in balancing seat since this action would have revealed 1114 HCP. He was compelled to begin with a takeout double with the intention of rebidding NT in the event that partner advanced with one diamond or one spade.
West's resolve to continue in the auction disclosed a good hand with black suit length. This action revealed at least five clubs and four spades. North passed and East was also content to pass, holding a spade tolerance and only two jacks. However, South was not about to subside since he owned a solid 18 HCP. His 1NT continuation, in all probability, revealed a hand stronger than a 1NT opening since partner might be completely broke. It would not be unreasonable to give up holding a balanced 15-17 HCP since partner could hold few values. The play in 1NT would be no bed of roses opposite a potential Yarborough. How would West fare in one spade? A trump lead and continuation at every opportunity would be the killer where the defense should be able to restrict West to six tricks earning a one-trick set.