Tsuki Ikkyo

This is a tanto attack from tsuki. I like it because the blend from nage leads so naturally into this particular ikkyo ura variation. They start quite far apart, with uke's footwork moving from gyaku hanmi into ai hanmi during the tsuki. Due to the ma-ai and footwork, nage blends with an irimi tenkan. We would more likely use a simple tenkan blend for nage, and have uke start closer with footwork beginning from ai hanmi.

You can see on the slow motion replay how nage rolls uke's arm forward and down after the tenkan, then into a threat of hyperextending the elbow. As nage moves into the pin, the forward foot is placed under uke's upper arm where it meets the shoulder, similar to how we would pin for a reverse kotegaeshi to increase the pressure on uke's elbow. I assume there is a similar motivating effect here.