Nice point. An adjustament could be made: the weak 5/5 majors can be described with 2H (2H opening = weak 5H/Other). This allow 2C opening to be standard strong. 1C opening becomes natural. 1NT opening decreases to 10-12 pts when no vulnerable. If vulnerable, 1NT is 12-14. Balanced 12-14 is described by 1NT rebid after 1C opening when no vulnerable. (if vulnerable this must be 15-17) Balanced 15-17 is described by 1NT rebid after 1D opening when no vulnerable Summary : 1C Natural or balanced 12-14 no vulnerable (open 1C followed by 1NT ) or balanced 15-17 vulnerable (open 1C followed by 1NT) 1D Natural or balanced 15-17 if no vulnerable (open 1D followed by 1NT) 1H/1S Natural 1NT Weak balanced (10-12 no vulnerable ; 12-14 vulnerable) 2C Strong 23+ 2D Multi (Weak 6 Major or 20-22 balanced or 4-4-4-1) 2H Weak Hearts+Other(8-10 pts no vulnerable, 10-12 vulnerable) 2S Weak Spades+Minor (8-10 pts no vulnerable, 10-12 vulnerable) 2NT Weak Clubs+Diamonds (8-10 pts no vulnerable, 10-12 vulnerable) Any thoughts about this approach ? Does exist any system similar? I would like to read the developments of it .. i can't risk do it my own ! :-)