smerriman, on 2020-October-09, 19:59, said:
By illegal I mean, at least in the ACBL, you actually aren't *allowed* to open it 2♣. Not sure what the regulations are in Australia.
This bid is not sanctioned at either the Basic or Basic charts, but these charts are for novice games.
This bid is not disallowed at the level of the Open or Open+ charts