[Retros] the two candidates for x=4 (1+1) SPG, using DR

[CAILLAUDM at aol.com]

Hello Andrew and everybody,


> Given the Dead Reckoning arguments earlier today, there are two candidate

> positions for the quickest way to reach a (1+1) SPG (x=4).

> 

> SPG 17.0?

> wKc2, bKg8

> wKe1, bKf7

> 

> Each extends an SPG to 16.5 by the capture of a rook. But how do the other

> proof games reaching this position end? If it's always with the capture of a

> minor piece (or in the latter candidate, Kf8xQf7 which would be forced) then

> by A1.3 (which is not optional except in fairy chess) we have an SPG. See

> P0005394 &P0005405 below.

> 

> The computer I am using at the moment isn't very powerful, and I haven't got

> Popeye. I think these are both long shots, but certainly they are worth

> checking out. I'd be very appreciative. DR should also be borne in mind for

> the x=5 quest.

> 

> Regards,

> Andrew.

> 

 
 Sorry, but Popeye found cooks :

  wKc2, bKg8
  for example, many games with 1.g4 17...KxRg8

  wKe1, bKf7
  for example, many games with 1.e4 17...Kf8xRf7

 So now, hope lies only in x=5...

Best,
  Michel
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