[Retros] Retrograde analysis in other forms

[Mario Richter]

> 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".

  mario