Well, Jim Burke doubled him during part of the fight and the fall, but Tucker DID do the bulk of it himself. It was kinda strange that Tucker's character was able to fire a shotgun at point blank range at Chisum (as he came thru the window) and STILL missed him. Then Chisum jumps him and they crash into a chair that smashes to pieces, but mysteriously is back together a second later for Chisum to fall onto.
Hey, you have to watch those Hollywood chairs. They're sneaky.