Gokyō
五教

Tantōdori sakatemochi gokyō

Uke attacks with tanto yokomenuchi sakatemochi. "When Uke's arm is open, Nage can step in and bring the arm out. However, if Uke continues and changes the form of his arm by closing it, Nage can no longer lead the danger away."
So the initial attack is chudan tsuki sakatemochi - bang - and when Nage wants to lead Uke's arm Uke changes form.
"Nage must therefore immediately grab Uke's wrist with his second hand from below. Of course with chudan tsuki, that wasn't possible.
This allows Nage to lead Uke's arm to the ground. This is gokyo."

Tantōdori sakatemochi gokyō

The grip from below to the wrist of Uke is important.
If Nage grabs the wrist like in ikkyō, Uke could stab further.

Tantōdori

kōkyu nage irimi
sakatemochi gokyō

For Gokyō, in the tsuzukiwaza, Uke attacks directly with sakatemochi yokomenuchi without prior doing chudan tsuki.

Tantōdori

Suwariwaza shōmenuchi ikkyō
Tachiwaza yokomenuchi gokyō

World Combat Games 2013, St. Petersburg