New duel mode ruleset:
A match (map) is split up into best of three rounds.
At the start of the match each player picks three different champions.
A round lasts until one player has lost all three of his champion picks.
After you die you can freely pick from your remaining two or one champions and respawn into the ongoing game.
After a round ends (one player has lost all three champions) the map / pickups get reset.
The winner is the player to first win 2 rounds.