[blml] Obviously this is the prime duty

[David Burn]

[HdW]

OTOH, North2 and North3 have told their partner that 4NT was not 
Blackwood. Those are in fact the actions of a downright cheat.

[DALB]

No, they haven't. South2 and South3 are presumed to be deaf when North2 and
North3 speak. If they give any indication that they have heard what their
partners say, then they are cheating - but North2 and North3 have committed
no infraction.

David Burn
London, England