[blml] Fwd: Decimal HCP ranges.

[Collins Williams]

On 7/4/07, Nigel <Guthrie at ntlworld.com> wrote:
>
> [Jean-Pierre Rocafort]
> unfortunately, i am afraid there is more of a difference. the
> "classical" notation 12-14, for a walrus needs the set of 3 integer
> numbers (12, 13, 14) in which 12 shows a hand of precisely 12 hcp
> the same notation means about the same thing for a non-walrus: the set
> of 3 numbers (12, 13, 14) in which 12 shows a hand the value of which
> approximates a mean hand of 12 hcp, maybe it is a hand of 12 hcp,
> maybe a weak 13 hcp hand which looks more like 12 than 13, maybe a
> strong 11 hcp hand...
>
> when using the continuous notation (with real numbers or decimal
> numbers as you see fit) 12.0-14.0 means the interval [12,14] that is
> to say the  set of all numbers greater than 12 and lower than 14.
>
> unfortunately if you want to make a correspondance between both
> notations, you must use different numbers: the equivalent of the set
> of 3 numbers 12-14, is the interval 11.5-14.5. in order to avoid
> confusion the first thing to do if wanting to use a continuous scale,
> would be to use the correct notation [11.5, 14.5] with brackets
> instead of the ambiguous 11.5-14.5
>
> {nige1]
>
> Or... using the Walrus variation 12.0-15.0, as previously explained.
>
> Or... Jean-Pierre might prefer [12.0, 15.0) because the "*real
> interval*" is *closed below* but *open above*.
>
> Strictly, of course, *none are real intervals* because the number of
> bridge hands is finite :) as any walrus could tell you :)


What all of this about high card point ranges seems to overlook is that
some, (are they called
Zonal Authorities?). the ACBL for example, regulate conventional responses
to 1NT openers based on the width of the range (presumably measured in Work
HCP).

How is a TD to interpret such a regulation in the face of a disclosure of a
pairs NT range as a probabilistic measure?

Or is it the view of people who are trying to get such information into
disclosure that such a regulation is not legitimate?

  Thanks

    Collins

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