Here's an interesting variant by the inventor of Racing Kings (Vernon Parton). The rules are described here: http://www.chessvariants.org/winning.dir/neutral-king.html
Basically, neither player has a king of their own, but there is a neutral king that may be moved by either player. The object of the game is to checkmate the Neutral King and prevent your opponent from doing so. I don't think there are ANY websites that have it! (Although there is a java applet at pathguy.com where you can play against a computer. But there's nowhere you can play against real opponents.) Brainking could have a world first!
(ocultar) Si estás a la espera de tu turno para mover, pincha con el ratón sobre "cambiar" situado en la página principal junto a "Actualizar", entones establece el periodo de actualización de la página a 30 segundos para que se visualice con mayor rapidez el momento de tu posibilidad de jugar. (Servant) (mostrar todos los consejos)