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"Is that what you want? A fight to the death?"
– Koss, 2154 ("Home")

Kirk and Spock engaged in kal-if-fee using a lirpa and an ahn-woon

The kal-if-fee (which literally translated as "challenge") was a Vulcan "passion fight" (traditionally to the death, but not necessarily) in which two Vulcan males fought for the right to mate with a certain female.

During the Vulcan mating ritual known as koon-ut-kal-if-fee, a female could claim kal-if-fee if she did not want the male arranged for her at childhood. At which point, the male arranged for her must fight the female's selected champion. If an outworlder was chosen as champion, they had the option to decline, in which case another champion would be selected. The lirpa and the ahn-woon were traditional Vulcan weapons used in the kal-if-fee. (TOS: "Amok Time")

Tholos referred to a Vulcan mating ritual in which the opponents are fighting until death in ENT: "The Andorian Incident". According to Mike and Denise Okuda, it was meant to be koon-ut-kal-if-fee though the ritual mirrors only kal-if-fee. ("The Andorian Incident", text commentary, ENT Season 1 DVD special feature)

In 2154, Enterprise NX-01 First Officer T'Pol threatened to declare the kal-if-fee when her betrothed, Koss, informed her that he intended to go through with their prearranged marriage. Koss responded by suggesting that T'Pol's "Human friend" Trip Tucker might make a suitable challenger. T'Pol consequently married Koss without calling for the kal-if-fee. (ENT: "Home")

In 2267, the Vulcan T'Pring, betrothed to Commander Spock of the USS Enterprise, claimed the kal-if-fee and chose Captain Kirk as her champion, all as part of a plot to evade her impending wedding to Spock and instead marry her preferred mate Stonn. (TOS: "Amok Time")

Females could also fight on their own behalf if they so chose. When Vorik underwent pon farr in the Delta Quadrant in 2373 and wanted to take fellow USS Voyager crewmember B'Elanna Torres as his mate, the half-Klingon female ultimately claimed the kal-if-fee and chose to champion herself. (VOY: "Blood Fever")

The USS Protostar holodeck included a holoprogram to fight in a kal-if-fee gladiatorial match. (PRO: "Kobayashi")

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