[Retros] Definition of themes in retro-wiki

[Nicolas.Dupont at math.univ-lille1.fr]

> "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.

Nicolas.