I have just implemented a new victory condition for Homeworlds at SDG 
called "Left Man Down."  The player who elminates the person to his left 
is the victor.  "Left" is relative.  In a 3-player game, or a 4-player 
game where West seat has already been defeated, South's left-hand 
opponent would be North.  I have not yet tested this code in a live 
game, but my offline tests show it should work.  If you have any 
weirdness in a live game, please let me know.  If you have an existing 
3/4-player game running and everybody would like the victory conditions 
changed, let me know and I will make that happen.
Enjoy!
Aaron
Super Duper Games
http://games.daltons.ca