Problem

The Auction:

East opened with 1♥. South doubled for takeout. West supported hearts – 2♥. North bid 3♠ (at least 4 spades). East passed. South bid 6♣. West overcalled – 6♥. North doubled. East passed. South raised to 7♣. West doubled.

West led the ♥3. How can South win 13 tricks?

Vul: North/South

Contract: 7♣ by South