Problem

The Auction:

* - Splinter bid, 0-1♣, 17-21HCP

West and North passed, East started with 1♠. South passed. West responded 2♠, North passed and East bid 4♣ – a splinter bid showing 0-1 clubs. South passed. West declared 4♠. At this point North suddenly interfered and called 5♣. East went on and bid 5♠. South doubled. We invite you to take the South seat – how are you going to defeat the contract?

Vulnerable: East/West