Keyless chucks normally have a knurled ring at the base of the chuck that you hold in one hand while turning the large knurled taper with the other. If the chuck has been overtightened, and you cant open like this, try using two stilson wrenches (Pipe wrenches) one on each of these parts. Use a soft cloth in the jaws to avoid damaging the knurling. You can also try some Q20 or similar into the chuck to help lubricate it.
Take a piece of 2 x 2 timber and use the flat side to give the chuck a whack on either side or three sides if you make a marks on the chuck with a felt tip
If you are frightened to damage the chuck wrap a bit of cloth around it first
The idea is to shock the retainers from the side, thereby imparting some movement back into the mechanism .
If you think about it how many times does a drill work loose when you are using a hammer action
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