Problem

The Auction:

North started with 1♣. South responded 1♠. North bid 1NT. South, instead of declaring 3NT with  abundance of HCP bid 3♦. North, who had a 3-card support for diamonds, declared 5♦.

West led the ♠3. Not surprisingly the declarer has a 7-card trump suit. As South can count six top tricks in side suits, the declarer needs five tricks in diamonds. But how can South win five tricks in diamonds holding a 4-card trump suit on longer hand and missing the ♦Q?

Vul: none

Contract: 5♦ by South