Promotion Variation
there is a nice YouTube video about this study. http://www.youtube.com/watch?v=uYfmJCjJN1E&feature=rec-HM-r2
5.c8Q Rc4+ 6.Qxc4 is stalemate
BTW
Yes, this is the Saavedra position. It is named after the guy that came up with 5.c8R. One of the most famous positions of all time.