[Retros] Retrograde analysis in other forms

Mario Richter mri_two at t-online.de
Wed Jul 3 16:44:09 EDT 2013

> 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".


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