Pankration

The martial arts used by Archer of “Black,” Chiron. Combining boxing and wrestling, it is most likely the first mixed martial arts in history. If you ask why the centaur Chiron-sensei knows something like this, it's because ancient boxing originates from the god Apollo.
In Chiron's case, this fighting style is included in “Wisdom of Divine Gift,” but he actually possesses skill in it equivalent to A rank. Eh, Plato-sensei? …His skill in it is EX Rank… probably…

Fate/Apocrypha material: Fate/Apocrypha Encylopedia