Meckwell 2003

Preempt

2¨-DBL=Takeout

2¨-2©=5+©

2¨-2ª=5+ª

2¨-2NT=§+©

2¨-3§=5+§

2¨-3¨=©+ª

2¨-3NT=Natural

2¨-4§=6+©,Strong

2¨-4¨=6+ª,Strong