[Retros] Fwd: Proof game promotion task

[joose norri]

Kevin, if your last paragraph refers to me, I apoligize. It was certainly not meant. I am not to blame, my poor English skills are.Joose


> Date: Mon, 10 May 2010 01:50:05 -0700

> From: kevinjbegley at gmail.com

> To: retros at janko.at

> Subject: Re: [Retros] Fwd: Proof game promotion task

> 

>  Good question, Noam..

> 

>  There are a few such achievements...

> 

>  1) the record length PG57.5, (8bR+8wR -- Pronkin & Frolkin),

>  2) diagonalized promotions (of Caillaud & Heinonen) already sited here.

>      orthogonalized promotions (Caillaud)

>  3) Pronkin & Frolkin made a number of others:

>     -PG45 (4wB+4bB+4bN+3bR in final diagram)

>     - Pronkin & Frolkin & Goldsteen PG52 (8wR+7bR+3bS in final diagram)

>     -PG55.5 (8wR+8bR)

>     -Frolkin PG52 (inexact)  6bB + 3bR

>     ...tons more...

> 

>    I did quickly skim through a large section of PGs >40 moves, in the

> Win Chloe database, and found no problem with 9 units of the same type

> & color (however, I may have overlooked something)...

> 

>    A pattern fast emerges, where it becomes clear that promoted force

> in the diagram was deliberately avoided -- even, it seems, if

> avoidance made their tasks more difficult (my guess).

> 

>    So, I suspect most would prefer to attempt the interesting task you

> outlined via Ceriani-Frolkin annihilation of 2 promoted units (to

> retain a nice diagram).

> 

>    I am not aware of any technique to directly search for such things

> in any PG database.

> 

>    Finally, I regret some discourteous responses which you encountered here...

>    ...which reads like an outrageous bid for partial credit.

> 

>    Regards,

>      Kevin.

> 

> 

> On 5/10/10, joose norri <joose_norri at hotmail.com> wrote:

> >

> >  Well not obvious or trivial, but uninteresting, apart from the task

> > element. I don't like counting promotions or whatever. Is one interestingly

> > motivated promotion less impressive than five trivial ones? Clearly I'm not

> > quoting my own thoughts.

> > Joose

> >

> >

> > > To: joose_norri at hotmail.com; retros at janko.at

> > > Subject: Re: [Retros] Fwd: Proof game promotion task

> > > CC: tchow at alum.mit.edu

> > > Date: Sun, 9 May 2010 22:53:18 -0400

> > > From: elkies at math.harvard.edu

> > >

> > > Tim Chow asked:

> > >

> > > > [...] What is the most number of knights (or queens, or whatever)

> > > > to appear in the set position of a proof game [with a unique solution]?

> > >

> > > Joose Norri responds:

> > >

> > > > Yes, obviously one could do -- but why!? Sorry, missed the irony.

> > >

> > > I don't see why this need be ironic or ugly; it looks to me like a

> > > legitimate task. And it certainly *doesn't* look obvious that one can

> > > promote all White pawns to Bishops in a sound proof game! For starters

> > > such a game must have length at least 39.5, and it's already nontrivial

> > > to attain such lengths at all, let alone with 40 pawn moves on one side.

> > >

> > > NDE

> >

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