Posted Today, 11:07
...which means that it would be legal in the 2025 version of my University of Waterloo Bridge Club (as it was - and was regularly played, including by me) in the 199x version. And, IIRC from MikeH's posts, it was and is allowed in at least one club in Vancouver on their Shark Tank night, provided the opponents get to say "no, thanks" (which effectively nobody did).
Clubs are absolutely entitled to make their own rules. They are *encouraged* to use one of the ACBL's charts, and the ACBL recommends using the equivalent chart to what the game would be at a Sectional (so, Open for unlimited games, Basic+ or Basic for MP limited or "mostly inexperienced" games, Open+ for occasional, experimental nights or in a "all flight A" game). But they can do what they wish. I don't even think there's a "max out at" level the way there (technically) was with the Superchart back in the day.
(technically): The U(W)BC was officially Superchart, before the defanging of the Mid+Charts with "minimum boardlength" (not that we'd have cared about those), because we weren't officially allowed to be any more liberal. With a "let the novices off the hook if they ask" caveat (which I do not remember ever being asked, and by "novices" we meant "still in Club Series Lessons"). But if nobody called the TD...I remember a player being told (in the bar, after the session) about an auction that started pass-1♦ (NAT, 8-12) and finding out they didn't have slam so stopping in 4NT. Of course, the director for the game had scored up and left the building an hour ago, and anyone who saw a resemblance between the director and that player was *clearly* too drunk to be a reliable witness:-).
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)