Covering an overhand right

The opponent throws an overhand right punch.
By bringing our left hand up and just behind our left ear, we can create an effective cover-block.
The value of a cover-block is that we can now establish an over-hook control on the opponents right arm.
Our right hand comes across and gets control of the opponents neck;
making it easier to deliver a strong right knee.
After the knee, which brings the opponents upper body forward, it becomes an easy matter to establish an under-hook control on his left arm.
Now we are set to take him down. Hooking our right foot inside his left knee,
fall back, bringing him with us,
and as we hit the floor kick over to the left and go to the mount position.
Make sure to drive into his chest with both hands
and move both of our legs at the same time.
Finish with a basic armbar from the mount.