[Retros] Retrograde analysis in other forms

Noam Elkies elkies at math.harvard.edu
Wed Jul 3 17:21:35 EDT 2013

"Mario Richter" <mri_two at t-online.de> writes:

[I wrote:]

> > I don't see any evidence that the wRa1 is

> > needed for some other role. Are we told something else about

> > the position that would eliminate that possibility?

> Yes - the game was played "at the odds of queen's rook",

> so there was no wRa1 at the beginning of the game, or as

> the official solution puts it: "the white Q R was off the

> board before the game began".

I see, thanks. I suppose a Rook-odds player would be rather
unlikely to find Black's winning combination, then...


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