This is a simple adjustment to counter the defense from the basic collar choke from the back mount.

This is a fun game you can play with your child to develop basic
strength and skills for grappling. Eventually they will use the same
abilities to do do certain moves in jiu-jitsu like taking the back from
the guard.

Music Credit: “The Builder” Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/

In this video Relson Gracie Black Belt Robin Gieseler shows you how to
play jiu-jitsu with your kids. The best way to develop
jiu-jitsu attributes when your children are young is by disguising the
movements as games. Here is an example of how you can develop hip
movement, fun and love for grappling in your child at the same time
bonding with them.

Relson Gracie Jiu-Jitsu Academy – Columbus instructor Robin Gieseler
demonstrates an inverted triangle with 3 options for the submission.

Training at Relson Gracie Jiu-JItsu Academy – Columbus

Relson Gracie Black Belt Robin GIeseler shows a simple and somewhat
flashy way to counter the double underhook guard pass.