Go to the options menu and set Illegal Blows to Off. Then, go to the fight 
store and buy the illegal head punch called Elbow Shot. During a fight, use 
the Elbow Shot to counter attack each time your opponent throws a punch. 
Note: Make sure you use the Elbow Shot as a counter attack so that you can 
connect cleanly and powerfully on you opponent's head. You will see that 
the Elbow Shot inflicts a lot of damage to your opponent, and will KO him 
in a short period of time, or TKO because you inflicted so much damage to 
his eyes.