members, the traditional fighting system of andes is called AMACHAKUY.IT IS a headbutting , kneeing system . the general idea is to grab the back of your opponents head and use various headbutts and knees to lower body. it was documented by JACK GROVER. he was a martial artist that had a job in which he did field reserch all over the his 1958 book, DEFEND YOURSELF, he describes not only this peruvian art but muay thai , varmannie, karate and pankration--[ arts not well known at the time]---ralph g