A fight for honor... Thats pretty cool. Anyways, he's fat a.k.a, no speed. Hit and run technique works fine. Keep your range, and attack with long punches, always keeping a distance. No matter what happens, dont get grappled. Post the results later and good luck.
PS: Dont lose ur temper. Fighting without thinking = stupid. Keep calm and focus on ur strategy
LET'S GO KNICKS