[Retros] Distance-PG

[Olli Heimo]

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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