Reverse Bergen convention is used by the responder after opening a partner 1♥ lub 1♠ and lack of opponents' intervention.

Answers:

• • 3♣ - artificial with a 4-card fit (nine trumps) in strength 10-12 HCP;

  • 3♦ - artificial with a 4-card fit (nine trumps) in strength 7-9 HCP.