[Retros] Distance-PG

[Eric Angelini]

Beautiful cook of my "Fastest 20 + 6SQR5", Olli -- bravo and thanks!

à+
É.
Catapulté de mon aPhone


> Le 28 août 2016 à 18:15, Olli Heimo <olli.heimo at luukku.com> a écrit :
> 
> The following has 6,5 moves, probably shorter ones are found.
> 2bQk1nr/1pp1pppp/n3N3/p7/8/8/PPP1KPPP/RNB2B1R
>    13
> 1. Cg1-f3   Pa7-a5     2. Cf3-e5   Ta8-a6     3. Ce5xd7   Ta6-d6    
> 4. Cd7xf8   Td6xd2     5. Cf8-e6   Td2xe2     6. Re1xe2   Cb8-a6    
> 7. Dd1xd8 Solution unique  0.43 secondes
> 
>> Eric Angelini kirjoitti 28.08.2016 kello 18:08:
>> For instance, the fastest Distance-PG
>> of total length 4(1+SQR2) ending in checkmate comes of course after the
>> well known:
>> 1.f3 -- e6
>> 2.g4 -- Qh4++
>> ... but as the White moves can be
>> exchanged, this is not a unique
>> solution.
>> à+
>> É.
>> Catapulté de mon aPhone
>> 
>> 
>> Le 28 août 2016 à 16:20, Eric Angelini
>> <Eric.Angelini at kntv.be<mailto:Eric.Angelini at kntv.be>> a écrit :
>> 
>> Yes Roberto,
>> a sound proof game of this (total) length,
>> and, in my dreams, the shortest one,
>> hopefully unique, I have in mind.
>> 
>> More generally, one can assign for
>> any past, present and future a single
>> such number, if I'm not wrong.
>> It would be nice to have unique
>> numbers "n" for precise tasks like:
>> -find the SPG of total length "n" ending in a checkmate;
>> -find the SPG of total length "n"
>> with a casling;
>> -find the SPG of total length "n"
>> with an en passant capture, etc.
>> BTW, what would be the geometrical
>> length of an e.p. capture?
>> But this is old hat, I'm sure, no?
>> à+
>> É.
>> Catapulté de mon aPhone
>> 
>> 
>> Le 28 août 2016 à 13:53, roberto osorio
>> <osorio.arg at gmail.com<mailto:osorio.arg at gmail.com>> a écrit :
>> 
>> Hi Eric,
>> 
>> with SQR5 you surely mean a knight move, so the PG has to include 6
>> knight
>> moves plus  straight displacements total 20 long.
>> 
>> Many unsound sequences  fit whit these requirements. When you say
>> "Find a
>> PG", do you mean "a sound PG"?
>> 
>> best,
>> Roberto Osorio
>> 
>> 
>> 
>> 
>> 2016-08-27 10:17 GMT-03:00 Eric Angelini
>> <Eric.Angelini at kntv.be<mailto:Eric.Angelini at kntv.be>>:
>> 
>> Hello Retro-fans,
>> This is for sure old hat, but do you know
>> a nicer example than my attempt
>> to produce an unique solution?
>> 
>> "Find a PG ending in checkmate where the pieces have  browsed
>> the distance of 20 + 6SQR5 units"
>> 
>> (read "twenty plus six times the
>> square roots of five" - the unit being
>> the side of a square, of course)
>> Best,
>> É.
>> 
>> 
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