nige1, on Apr 2 2008, 08:41 PM, said:
Jlall, on Apr 2 2008, 06:09 PM, said:
dburn, I think you are totally wrong. I think a much better way of looking at it is this: If partner bid 5C without any hesitation, his range of hands would look like this {y}. Opposite range y, I make slam about 30 % of the time. If partner bid 5C WITH a hesitation his range of hands would look like this {x}. x is a tighter range than y that does not include the worst 70 % of hands in y, and includes some hands that were not in y that make slam very good. Opposite range x I make slam about 70 % of the time. Because of the hesitation, there is a much better chance of making slam thus you can take advantage of the UI by bidding slam. Now, just because partner HAPPENS to have a hand at the bottom of range x making slam very poor, that doesn't mean you didn't take advantage of the UI to bid slam. It just means you got unlucky in your cheating. This doesn't entitle you to keep the result of 6C making 6. You need to think of this not as a specific hand but as a range of hands that partner can have.
I agree with the JLall's argument

but go even further

IMO, it doesn't matter what hand partner actually held; or what he was really thinking about; it matters only that (arguably) his hesitation
suggested a call that turned out to be more successful than a non-suggested logical alternative.
But I'm concerned about the jocular inference that the 6
♣ bidder "cheated"

I feel that we should be wary of such remarks, even in jest

This is isomorphic to the idea that once partner hesitates, you cannot get a good result, "because" to hesitate is to cheat. This idea is the result of deeply muddled thinking, compounded by the notion that Bobby Wolff (and Bobby Goldman) must be wrong.
The Laws do not ban thinking. What they ban is actions based on unauthorised information, and to rule that a player has used unauthorised information, one needs to establish that some transfer of information has taken place.
To see this, consider:
♠AQ3
♥K64
♦QJ95
♣A62
You open 1NT, 15-17. Partner thinks, then bids 2NT (natural and invitational). What call do you make?
Now, I do not very much care how the super-theorists would evaluate this hand, nor do I care whether you have methods that distinguish some raise to 2NT from some other raise to 2NT. Nor do I want anyone to run a simulation based on how often this hand will make 3NT facing an average raise to 2NT. No doubt these are valuable contributions to theory, but I am not talking about theory - I am talking about the law.
The Guthrie-Lall conjecture states that at this point,
you cannot get a good result on this deal. Suppose you pass. Partner puts down a hand opposite which 3NT will make about 70% of the time, but on this occasion it fails. The opponents complain that partner's slow 2NT could have suggested that he had a marginal raise, so you ought to have ignored that putative suggestion, bid 3NT, and gone down.
Suppose you bid 3NT. Partner puts down a hand with which he might very well have passed 1NT, but 3NT makes on a couple of finesses and a 3-3 break. The opponents complain that partner's slow 2NT could have suggested that he had a hand almost worth 3NT, so you ought to have ignored that putative suggestion, passed 2NT, and made three.
Again, I want you to consider this argument without reference to your own personal tendencies towards "open aggressively, raise conservatively" or the converse. If you do so, I hope you will realise that the Guthrie-Lall conjecture is essentially no more than "if it hesitates, shoot it" and, more importantly, has nothing to do with what the law actually requires of players or of arbiters.
As to what the law actually does require - well, as Ambrose Bierce remarked, "it has been defined by five hundred lawyers in three volumes each. So how can anyone know?" But as an exercise, consider this thought experiment:
♠AKQJ109876543
♥2
♦None
♣None
Before you can open the bidding with 4NT, partner blurts out "this is the first hand tonight when I have had the ace of hearts".
You, being hard of hearing, believe him to have blurted out "this is the first hand tonight when I haven't had the ace of hearts".
RHO, who is actually the dealer, opens 6
♦. What call do you make? You may say "I call the Director", but there is none. This is a private game among honourable people, and it is up to you to act in accordance with the law.