Meckwell
2006
1NT-DBL(non-penalty)
Pass=#SYS on
1NT-DBL(penalty)
Pass=Round
Pass-RDBL=No 5cd
Pass-2§¨©ª=5cd
RDBL=§+© or ¨+ª
2§¨©ª=5+cd,Natural
1NT-Natural overcall
2§-#Handle
2¨-#Handle
2©-#Handle
2ª-#Handle
3§-#Handle
3¨-#Handle
3©-#Handle
3ª-#Handle
1NT-Art.overcall