[Retros] 50-moves draw revisited

[Joost de Heer]

> It was decided that "something 

> about castling" needed to be conceived as "essential progress" in the 

> game and therefore should be incorporated in the 50-moves rule.


I doubt it was the 'essential progress' that caused this to be added to 
the 50 move rule. It has more to do with 'irreversible change of the 
position'.

Joost