After a minor-suit transfer.
Holding a long minor opposite a 1NT opening, responder uses a transfer in order to let the strong hand become declarer. But once opener has executed the transfer, he must further specify his hand.
In particular, he shows his singleton at the three-level in order to see if it’s indicated to play either Three No-trump or game (or even slam!) in the minor. That way, opener will sometimes have the last word depending on his holding in responder’s shortness.
In French standard, bidding 3-of-a-major after a minor-suit transfer allows you to show shortness in the other major: West therefore bids 3♥ to show his singleton Spade. East has what it takes opposite the missing Spade stopper and serenely signs off in 3NT, the winning game.
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