Duels

Duels (デュエル) are authorized Player versus Player (PvP) fights that can take place even in safe areas and will not change a player cursor from green to orange by killing the opponent. Known games that have duels are Sword Art Online and ALfheim Online.

Procedure
To make a duel a player must send a request to another player. The latter must accept the request, and is then given the right to decide the type of the duel. At the beginning of the duel, the player will have sixty seconds to prepare for the duel. Once the duel begins, the Area effect is lifted from the two duelists.

If the victory condition for the duel is not met within the time limit, the victor is chosen based on who had more Hit Points (HP) remaining at the end of the duel; however, the Hit Points are rounded in increments of five, thus minor differences in Hit Points will result in a draw. After a duel is concluded, a window indicating the winner will appear between the participants if they are within ten meters of each other. If the participants are farther apart at the end of a duel, then two windows will appear at the closest point to both the winner and loser separately.

Types of Duel
In Sword Art Online and ALfheim Online, three types of duels exist:
 * Total Loss Mode: Rarely used in Sword Art Online, since it will only stop when a player's Hit Points reach zero, which results in permanent death for the loser. This is type of duel can be used for Sleep PK.
 * Half Loss Mode: The winner is decided after the other player loses half of their hit points. Rarely used in Sword Art Online, as a critical hit could reduce someone's Hit Points to the danger zone.
 * First Strike Mode: The most common type of duel in Sword Art Online. The winner is decided by whoever lands the first clean hit or whittle the opponent's HP to half.

Trivia

 * In the web version of SAO, duels could also be conducted without consent by the other party in the fighting arena in the Starting City during the beta test of SAO.

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