Another IB

[barmar]

I was thinking of something like 1♣ (2♦) 1♠ corrected to 2♠. It's not exactly like my example because they're not mutually exclusive, but overlaps, and 2♠ (5+♠, 11+ points) is more specific than 1♠ (4+♠, 6+ points).

 

But maybe in a different system there would be calls like this that have mutually exclusive point ranges.

[lamford]

Why is this allowed? Perhaps because in many cases this is likely to result in the offending side getting too high, so the opponents won't be damaged.

Rubbish. If the auction goes 1H-(2S)-2H changed to 3H then the offending side are not going to get as high as if the auction had gone 1H-(2S)-3H, as even RR can see that 3H is a stretch. And you would allow that change despite the fact it gives much more information to the offenders than the auction 1NT-(2S)-2C corrected to 3C. The suit specified in 1NT-(2S)-2C (missing by a level) is clearly clubs, as it is in 1NT-(2S)-3C. In the old days the TD could decide that 1NT-(2S)-2C was not incontrovertibly natural, as it would have been Stayman in a different auction, but that has now been removed.

[Vampyr]

Typical for the WBFLC to use a word whose meaning is highly subject to interpretation.

[pran]

I was thinking of something like 1♣ (2♦) 1♠ corrected to 2♠. It's not exactly like my example because they're not mutually exclusive, but overlaps, and 2♠ (5+♠, 11+ points) is more specific than 1♠ (4+♠, 6+ points).

 

But maybe in a different system there would be calls like this that have mutually exclusive point ranges.

This example fails on two accounts: Neither the IB nor the replacement bid "shows" a denomination different from the named one, and the replacement bid "shows" a subset of what the IB "shows".

 

Both Laws [27b1(a) and 27B1(b)] are applicable.

 

You should be able to do better than this.

 

Remember I asked for a real auction with an insufficient bid and a replacement bid where neither of them named the denomination "showed", and for which Law 27B1(a) is applicable but not Law 27B1(b).

[blackshoe]

Remember that back in the thirties artificial calls were a rarity (except for 4NT).

And takeout doubles.

[pran]

Remember that back in the thirties artificial calls were a rarity (except for 4NT).

And takeout doubles.

Indeed.

(I must admit I was mainly thinking of bids, and a double can never be insufficient).