How to use elbow techniques to become the winner! This clip on youtube.com was quite old but it will teach you the vital Muay Thai technique to you need to know.
You can use you elbows to hit your opponent at the very thin part of his face especially between the lower part of his eyebrow. When you get cut, the blood will come into his eyes. The referee will stop the fight and you will become the winner. (No need to fight for 5 rounds)
If you want knock him, just point your elbow directly to his chin bone. If the impact is heavy enough, he can sleep for more than 10 seconds! That’s it!!