has nothing to do with the chin.... chin by definition means how many times you get knocked on your ass/ get rocked , not necessarily knocked OUT
Absolutely incorrect. Chin has to do with what happens when you are put on the canvas. The tell-tale sign of a glass jaw is when a fighter hits the deck, but doesn't get up. Which is exactly why Rahman has a glass jaw, while Klistchko's chin is only shaky. And tonight's fight will show this.