Quote
Law 27C: if the offender replaces his insufficient bid before the director has ruled on rectification, unless the insufficient bid is accepted as A above allows, the substitution stands. The director applies the relevant foregoing section to the substitution.
The IB was accepted, so the substitution does not stand. However,
Quote
Law 9B2: No player shall take any action until the director has explained all matters in regard to rectification.
and
Quote
Law 9C: Any premature correction of an irregularity by the offender may subject him to a further rectification (see the lead restrictions in Law 26).
Law 27C doesn't say what to do if the IB was accepted. However, in this case, the acceptance was by way of calling (he passed). So Sven is right, it is North's turn to bid. So the question is, "is 1NT a premature correction of the IB, or is it a bid out of turn"? I think since South was clearly trying to correct his IB, we should treat it as such, and not as a bid out of turn.
My ruling: South's 1
♠ IB was accepted when West passed (Law 27A). The attempted correction is cancelled, and any information arising from it is UI to NS, AI to EW (Law 16D). Further, North drew attention to the IB
before South attempted his correction. When attention is drawn to an irregularity, the director should be called, and
no player shall take any action until the director has ruled (Law 9). That last is a very serious prohibition, which the laws say should draw a procedural penalty more often than not. Under the circumstances, I am issuing a warning: if this pair does this again, a PP in matchpoints will be assessed. Law 90 applies. (I'm basing this on the assumption that this is a normal club game, and these players are not necessarily aware of all their legal obligations, and have not been warned already).
Question: is there an issue here which should invoke Law 83, so that the TD should inform the players of their right to appeal? It seems to me not, that the ruling is a matter of law, but I've been wrong about that before.