Stayman is a cuebid of opponent’s bid or implied suit.
South, with 17 high card points, opens one notrump. West makes a transfer bid of two hearts. North can now bid two spades or three spades as nonforcing and forcing Stayman respectively.
North chooses to treat his ten points as eight or nine because of the singleton king of spades and makes an invitational bid. South accepts the invite and bids 3NT.
The contract: Three notrump by South
The opening lead: The queen of spades
Dummy wins the opening lead and plays a diamond towards his hand. East jumps up with the ace while he still has his second spade and puts this spade on the table.
Declarer will only get eight tricks before West runs his spades. However, if by chance, declarer drives out the ace of hearts first, he will make eleven tricks.
The result: Three notrump by South either down one or making plus two.
-Two spades is a risky contract vulnerable. It goes down two for -200. West is not strong enough for a vulnerable overcall. KQJxxx of trump would be a wiser overcall.
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