Problem

The Auction:

South has opened the auction with 1♠, North responded with 1NT – forcing (0-3 spades, 4-12 HCP). East doubled (4+clubs, 4+diamonds, 4+hearts.) South jumped to 3♠ (6+ spades, 14-21 HCP).

North declared 4♠. West leads the ♦J.

We offer you to take the South seat and plan the play to win ten tricks.