Similarly to Coalition Wars, you can challenge other players to a Duel during a game. The Duel button is located in the Players menu, next to the Diplomacy buttons. The rules are simple - the first player eliminated from the game loses the duel. If both are eliminated in the same turn or both win the game, duel is cancelled.
Elo is the competitive rating system
. In the beginning, everyone has 1000 Elo points, which then go up or down depending on how well you do in the duels.
Elo gained/lost in a duel depends on the difference between the Elo ratings of the opponents.
Season Elo is reset to 1000 in the beginning of each season (Winter/Spring/Summer/Autumn).
Minimum rank to participate in a Duel is 2. Latest duels are shown in player profiles.