In BJJ, if you throw someone with Seoi Nage, you have a 50% chance of getting your back taken. This happens even to the most experienced Judoka and wrestlers. This is why we need to make a slight adjustment to the throw to make it perfectly adapted for BJJ and its specific ruleset.
Seoi nage is a shoulder throw, one of the traditional forty throws of Judo as developed by Jigoro Kano. It belongs to the first group, Dai Ikkyo, of the traditional throwing list, Gokyo (no waza), of Kodokan Judo. It is also part of the current 67 Throws of Kodokan Judo. It is classified as a hand technique, te-waza.
The specific techniques of morote-seoi-nage (two hands seoi-nage) or eri-seoi are generally called seoi-nage. The distinctive technical aspect of this classification is that tori (the one executing the technique) grips with his two hands as opposed to Ippon Seoi Nage in which only one hand remains gripping while the other slides under uke’s (the one receiving the technique) armpit. Seoi nage is one of the highest-scoring techniques in Judo. Renown seoinage martial artists are Isao Okano and Toshihiko Koga. In BJJ, famous seoinage competitors include Saulo Ribeiro, Fernando Margarida, Ronaldo Jacare, and Rodolfo Vieira.
Drop (knee) seoi-nage, sometimes called drop seoi-nage is a variation where you drop deeper than usual.
Judo Black belt Kathy Hubble on how to do do the Judo takedown Ippon Seio Nage in BJJ without exposing your back. Notice that does the throw on the side:
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