The Aikido technique Katate Tori Hantai Ikkyo is very effective to use to help pin an opponent. Learn how to pin an attacker using the Ikkyo Pin in this free video. Expert: Gary Boaz Bio: Gary Boaz has been training in Aikido for 17 years, he is a 4th degree black belt under Fred Mastision Sensei of Aikido of Phoenix. Gary teaches Aikido, Kyusho-Jitsu, and Brazilian Jiu-Jitsu. Filmmaker: Dustin Daniels