[blml] Illegal convention

[Steve Willner]

Anybody know what the ACBL rules are when an illegal convention is used?

Yesterday, we opened 1NT and heard a 2D overcall, which turned out to 
have an illegal meaning.  This was in a team match, and the board had 
not yet been played at the other table.  What should the ruling have 
been? (The TD had us redeal, which was fine with us, but I have no idea 
whether it was technically correct.)