[Retros] Definition of themes in retro-wiki

[Joost de Heer]

Nicolas.Dupont at math.univ-lille1.fr wrote:

>> "Half" is nearly as bad - I object to the false arithemeticity.

> 

> Humm... A Schnoebelen can be seen as a promoted piece :

> 

> . Captured by an officer

> . Moreover at home (and without previous move)

> 

> Therefore, calling "Half" a promotee with only the first condition is not

> shocking to my eyes. As a half-group in maths, it has more or less half of

> the properties needed.


And you pick out the one property that's purely incidental for a 
Schnoebelen promotion. It's an implied property of a S-promotion, not a 
property itself.

Joost