i almost finished that game, got 2 more, my tipe is to invest in punch power and stamina recovery, t hat way u can punch hard and with minimum rest.
regarding chris try waiting a little and defendin g and then attack him without stopping that would do the trick.
i beat the champion with ease let me tell u he got some hard punches one punch he can take half of y our hp but i backed him up with double uppercuts (a+b+up also i used mooshmoosh advice about the pu nching power and staminia recovery and thats how i beat the game and um one more thing you have to be a member at free online games to post your score