Something a bit similar used by me for a couple of years: 1♣ 11+ nat unbal, 15+ bal, 18+ any 1♦ 11-17 unbal 1M - 11-17 5CM 1NT 11-14 2♣ preempt with 54+ majors 2♦ multi (or Wilkosz where accepted) 2♥♠ pre with 5 suit bid and 5 minor (weak two where Wilkosz 2♦ accepted)