Johnny Luken wrote on Thu, May 7, 2015 02:03 PM UTC:
This game is conceptually appealing yet famously poor.
An improved subvariant is what I would call "Spotters" Chess, where a piece captures only when another friendly piece has the piece in its sight (the spotter).
On playtesting this subvariant is decent, but still not great.
Making captured pieces be converted adds complexity. Maybe that would make a worthwhile game for this concept.