Meckwell 2006

Preempt

2©-DBL=#Lebensohl

2©-2ª=5+ª

2©-2NT=§+¨

2©-3§=5+§

2©-3¨=5+¨

2©-3©=ª+§

2©-3NT=Natural

2©-4§=strong + minors

2©-4¨=6+ª,Strong