[shugart24]

In ACBL world, is there any rule that prohibits my NT range from being 13-15 if my shape is 5332 and the range is 10-13 if my shape is not 5332 ?

[Gerardo]

From ACBL Convention Charts, updated June 2025

----------
"7. "Range": "15-17" is a range of three points (15, 16, and 17). "10-12 or 15-17" is a range
of 8 points. (The difference between the extremes of 10 to 17 inclusive.) If a pair plays
one NT range when Vul. or in certain seats (e.g., 15-17) and another NT range when Not
Vul. or in other seats (e.g., 10-12), those are two distinct ranges of 3 points. It is only
when a bid could be either 10-12 or 15-17 at the time making the bid that the range
would be considered to be 8 points"

Basic, Allowed
4. A Natural NT opening bid, as long as it shows at least 10 HCP and the Range is not
greater than 5 HCP

Basic+, Allowed
4. A Natural NT opening bid, as long as it shows at least 10 HCP and the Range is not
greater than 5 HCP

Open, Disallowed
5. *** A Natural 1NT opening bid that has a Range greater than 5 HCP.

Open+, Disallowed
5. *** A Natural 1NT opening bid that has a Range greater than 5 HCP.
----------

As your proposed 1NT is effectively 10-15, a 6 point range, it is not allowed in any chart.

[mycroft]

...but "11-13, but could be 14 or 15 if 5332" would be fine (but you should explain it, probably even announce it, that way. If you Announce 11-15, if they ask, definitely tell them).

Just don't upgrade even the best 10.

[Shugart23]

Thanks , both of you