C'est le dernier à avoir gagner une planète qui l'emporte. Le seul cas d'égalité se réalise lorsqu'aucune planète n'est remportée de la partie.
Page 16 du livret de référence en VO section "winning the game" :
If the battle for the last planet resolves with neither
player winning the game by one of the above conditions,
the player who most recently added a planet to his
victory display wins the game. (This is usually the
player who won the final planet.) If neither player has
added a planet to his victory display in the entire game,
the game ends in a tie.