The Cross Armlock

Read the whole article -FightingArts.com. A good point the author makes is that wrestlers try not to roll belly-up, but that it's much more dangerous to be on your belly.

Reality check: My concern would be a bite being taken out of my thigh or the back of my knee. If it isn't locked in quick, or the initial pain doesn't cause my opponent to submit, I could be vulnerable.

"In the photo sequence that follows, the cross armlock is executed by a person
who is above and positioned across the opponent. The exact position is not
important. Many other starting positions are possible."
[As always, click the photo to see it larger]