[Shugart23]

Well, I’ve been opening 2M for the last 2 years which shows exactly 4 cards in the Major and a longer minor. Took a glance at the GCC chart ; now I wonder if this is illegal? Having 4 cards in the Major deems the opening a natural bid by the definition so good on that. I know I can open 1M with a 4 card suit and a longer side suit. So can I continue?

[jnichols]

The GCC is quite a bit out of date.
However, the "ACBL Convention Charts" document does permit your bid

[Shugart23]

Whew!!!!! Thx

[awm]

My reading is that this opening is Quasi-Natural (a bid at the two-level showing four cards in the suit) but not Natural (which requires five or more cards in the suit at the two-level or above). This makes it legal on the Open Chart and above (regardless of strength) but NOT on the Basic or Basic+ chart. In general that means it should be allowed in open events (but likely not in "gold rush" events or B/C/D events or other things with fairly low masterpoint limits).

The new charts are here.

[johnu]

The ACBL GCC chart was discontinued in 2018 and replaced by the current Basic/Basic+/Open/Open+ charts (since modified).