VixTD, on 2012-May-28, 07:29, said:
Isn't this much the same as 2 above? West shouldn't do anything until the director has given a ruling. If 1♣ was inadvertent, it can be corrected and the auction proceeds as if there never had been an insufficient bid, so there is nothing to accept (despite what law 27A actually says). If the TD rules that 1♣ was not inadvertent, West has the option of accepting it, but if he doesn't South's 2♣ bid stands, and North is forced to pass for the remainder of the auction (law 27C). NS may be subject to lead penalty if they end up defending.
Here we see one major difference between Law 25A rulings and Law 27 rulings:
When Law 25A applies then the offender (South) corrects his inadvertent call to the call he intended. The unintended call is considered never made and thus for instance cannot be accepted.
When Law 27 applies then neither the offender nor for that sake the Director can prevent offender's LHO from accepting the insufficient bid if this is what he wants. If LHO accepts the insufficient bid by making his own (subsequent) call but does so before the Director has completed explaining "all matters in regard to rectification" (Law 9B2) it is at worst a minor irregularity which seldom if ever should result in any penalty.