Roudi occurs in sequence: 1m–1M-1NT–2♣ and guarantees the five and 11+ HCP. 

Responder bids:

• • 2♦ - no support 11-13 HCP;

  • 2♥ - support 11-13 HCP;

  • 2♠ - support 14+ HCP;

  • 2BA - 14+ HCP no support;

  • 3BA - 15+ HCP no support;

After a suit or NT intervention, checkback convention is off.

It is used in systems: 

• SEF

• WBridge5

Compare to similar conventions.