Breathing power throws, i.e. all techniques that do not use levers or grabs, but let uke's energy go past or redirect it using a simple contact.
The term Kokyu-nage is not clearly defined. Sometimes it is extended to techniques which are already known under specific names, e.g. Sumi-otoshi. In most cases, Kokyu-nage refers to all free throws.
There are no pins in Kokyu-nage techniques.
Search "Basic Forms" page for videos showing KOKYU-NAGE