[Retros] StrateGems 49 (Jan-Mar 2010)

[Kostas Prentos]

Mea culpa!

The author's intention was  "3 variants" but I somehow changed it to "3 
solutions" when I was preparing the diagrams.
It doesn't make much difference as far as I understand it, but I think it is 
only fair that the original wording of the author is restored.

My apologies,
Kostas

----- Original Message ----- 
From: "Kevin Begley" <kevinjbegley at gmail.com>
To: "The Retrograde Analysis Mailing List" <retros at janko.at>
Sent: Wednesday, January 06, 2010 12:26 AM
Subject: Re: [Retros] StrateGems 49 (Jan-Mar 2010)



>I see your point, Joost...

> ...and it is a good one.

>

> However, the analysis is rather nuanced... mine is a technical point...

>

> I don't want to debate it too much, given that it would be improper to

> delve into an unpublished solution here (given that SG actually has

> active solvers), but I nevertheless claim there are 3 variants (and 3

> solutions is probably the wrong wording).

>

> Kevin.

>

>

> On 1/5/10, Joost de Heer <joost at sanguis.xs4all.nl> wrote:

>> Op 5-1-2010 23:00, Kevin Begley schreef:

>> > R0154 seems to have been slightly misprinted...

>> >

>> > It should read "3 variants"   or  "3 unique variants"  but not

>> > "3.1.1..."  (which, I believe, implies 3 solutions).

>> >

>>

>> The printed text says '3 sols.'.

>>

>> 3.1.1... is a numerical representation of the solution tree (solution 

>> tree

>> starts with 3 branches, each of these has 1 level-2 sub-branch, each 

>> level-2

>> sub-branch has one level-3 sub-branch, etc). So IMO, this notation is

>> correct even with AP problems (the solution tree has 3 starting branches,

>> each of which is validated in a later sub-branch). The notation doesn't

>> imply that all solutions are possible at the same time in the

>> begin-position.

>>

>> Joost

>>

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