Description: Duel on Board is a 1 vs 1 local multiplayer competitive / party game where pirates fight for the precious beer while sailing the dangerous high seas. AHOY THERE! Duel on Board is a 1 vs 1 local multiplayer competitive / party game where pirates fight for the precious beer while sailing the dangerous high seas. These are the rules of the duel: -Reach the center of the ship where the beer is placed. -Don't get thrown off the ship.