[blml] Obviously this is the prime duty

[Konrad Ciborowski]

> [SW]
> 
> Suppose NS play weak NT non-vul, strong NT vul.  South has 13 points and 
> opens 1NT.  North (say in the ACBL or EBU) announces "15-17."  South 
> looks up and to his horror (though he hides it well) sees that his side 
> is vulnerable; North has given the correct explanation.
> 
> West passes, and North bids 2H, which is a transfer over a strong NT 
> (and obviously what North intends) but natural and non-forcing over 
> weak.  Should South announce "Transfer" (EBU/ACBL again) or keep quiet 
> (natural non-forcing being non-alertable)?
> 
> I think there's a 100% clear answer to this, but to my surprise, not 
> everyone seems to agree.
> 
> Of course South must _bid_ as if 2H is natural and non-forcing; I don't 
> think there's any doubt about that under present interpretations.  The 
> question is how South should _explain_ (and alert).
> 
> [DALB]
> 
> South should announce "transfer" (ACBL) or "spades" (EBU). He should then
> pass.
> 
> I don't think this is a problem under either the dWS or the MS
> interpretation. The problem with the dWS arises when South opens 1NT
> vulnerable and hears North announce "13-15" (a misexplanation; North has
> either forgotten the system or not noticed the vulnerability). Now North
> bids 2H, which he intends as natural and non-forcing but which is
> systemically a transfer. Per the MS South announces "transfer" or
> "spades"
> (the correct description of the method, though an incorrect description
> of
> the North hand) and bids 2S. Per the dWS South makes no announcement (the
> wrong description of the method, though a correct description of the
> North
> hand) and presumably bids 2S (but see below). 
> 
> Under the MS, the opponents at least know that South just has a strong no
> trump. Under the dWS the opponents might conclude that South, who has
> removed a sign-off in 2H to 2S, has: psyched 1NT; or bid 2S as a game try
> with a super-maximum, heart support, and spade values; or opened 1NT with
> five to 100 honours in spades and two low hearts; or...
> 
> But why should they have to guess? 

You seem to be under the impression that all the MI given
by a player who follows dWs will go unpunished. It won't.
Instead of describing 2H as a transfer to spades South 
told his opponents that 2H is natural and non-forcing.
South will correct this when he becomes declarer or
dummy (or after the hand is over when he becomes defender).
If the opponents have been damaged by this misexplanation 
the TD will adjust.




-- 
               Cibor

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