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ACBL convention chart - the 5 point notrump rule

I think there has been some good and useful dialogue regarding the new convention charts. One new rule imposes a five point range on 1NT openings. As I am now coming to understand the rule, if my agreed range is 15-17, I can use judgment to upgrade a 13 count because 13 to 17 is a 5 point range, but I can't open a 12 point notrump because it is not a psyche and would make my range six points.

What happens if a partnership, again playing 15-17, upgrades a 13 and then subsequently downgrades an 18? Different tournaments, different sessions, consecutive boards? Do they now have a six point range? Which bid is illegal? What is the sanction? 

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