School can be boring at times, but its an obligation to educate the peasants so they can reference to a fact sheet when they talk chins :smoke
Marquez is A+ class A chin on par with GGG and Hagler and more solid that McCall and Vitali I can respect that :nod
You might want to see JCC Sr facial expression, when the Uncaged Lion was eating his heart twice...how helpless :| Oscar stopped JCC sr twice, then Tszyu, then Wiley JMM chin is legendary because it endured Pacman Violence for 42 rounds to deliver the proverbial 1 punch KO revenge JCC score is 3.5% KO loss ratio, which makes his chin B Grade next to Holyfield :smoke
Chad Dawson 5.1% KO loss ratio, puts him in the D Class Vassiliy Jirov 2.4% KO loss ratio, gets his chin a B+ Grade