AW: [Retros] Massacre SPGs

[CAILLAUDM at aol.com]

> Francois Labelle wrote:

> 

> >The missing PG is:

> >

> >wKg1, bKf8, bBd7

> 

> Very interesting!

> 

> >It'd be really interesting to know what your program thought for this SPG:

> >

> >- If it saw 0 solutions, then your program had a bug.

> >- If it saw >= 2 solutions, then *my* program has a bug and I'd very much

> >like to know about it! (Alternatively people can try to find a cook by

> >hand if they're so inclined).

> >

> >The PG does have the unusual property that the surviving piece is black,

> >i.e. it's a (1+2), all the 17 others are (2+1).

> 

> I now remember that even though we had some very powerful hardware available

> at that time (1994), we had to split the calculation in two cases:

> (xwhite,xblack) = (2,2) and (3,1) (xwhite = number of non-capturing white

> moves)

> I assume that we did the calculation only for the first case. This means

> that your program verified the 17 PGs with (2+1) pieces and it found

> a new one with (1+2) pieces!

> 


 Indeed, that is probably what happened as the new one is C+ by Popeye (that 
is rather powerful for testing these kinds of massacre PGs).
 Very impressive, all these finds by Francois. Congratulations!

 Best,
  Michel
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