H. G. Muller wrote on Sun, Apr 5, 2015 08:14 AM UTC:
> for all turn-based, two-player chess variants that, with perfect play, a decisive, game-winning advantage exists for either white or black
I am not sure if I read you correctly, but this sounds to me like you exclude the possibility that the initial position is a theoretical draw. Yet this is the consensus opinion on orthodox Chess. And for a 'Chess variant' where both sides would start with just King + Rook (on d1/e1/d8/e8, say) this has even been proven.