Uke attacks from the front but tries to grab the shoulders of Nage from behind. Nage move to the side off-line bringing both knees together then steps forward with the outside leg.

Kokyu-nage

The initial movement is to the side offline with a strong step forward while bringing both hands forward and down to the mat. Nage’s face comes down very low such that his face almost touches the mat to give power to the throw.

Ikkyo/Nikyo/Sankyo etc

The initial movement is to the side offline bringing both knees together before a medium step forward with the outside leg. The step forward is less forceful than with kokyu-nage and the knee does not need to touch the mat before drawing back. This is sufficient to off-balance Uke without throwing him and is similar to the Ushiro Tekubitori techniques in the implementation of Ikkyo, Nikyo, Sankyo etc.