After a natural 1♣ its very tough. The best I can think of is. 1♣-(2NT)-X-(3♥) pass - pass -3♠-pass 3NT-4NT 6♣ 4N is optimistic at best. Playing precision is a lot easier and there shouldnt be any problems. 2. 2♣-2♥ (0-5) 3♠ (5♥4♠) 4♦(agrees ♠ max )-6♠ Actually the 3♠ bid was not part of the system, but it is something that I would like to add. If this is not available I am never getting there. Playing precision: 1♣-1♦ 1♥ (forcing balanced or nat)-1♠ 2♠ (5♥4♠ Gforcing)-3♠ bla bla slam 3. 1♣-1♠ 2♥-2♠ (5+ Gforcing) 3♣-3N 4♣-5♣ 6♣ Precision: 1♣-1♥ (8-11) 2♣-2♠ 3♥-3N 4♣-4♦ (do something intelligent?) 6♣ The 4♦ is questionable, but 4♥ sounds like preference and 4♠ like an offer to play.