say you get an average round nothing special but its obvious who won the round..
that makes a 10-9 round
one knockdown for a fighter makes a 10-8 round
two knockdowns make a 10-7 round
more then that doesnt usually make much difference as most major judges wont score more then a 10-7 round as it puts the opponent too far behind...
sometimes the 3 knockdown rule is in affect and the fight is stopped after 3 knockdowns..sometimes not
but mainly if someone is getting theyr ass beat and is dropped more then three times the fight should be stopped... the only time ive seen fights that have reached four or five knockdowns is in fights where the knockdowns were not hurting punches but the fighters were jus overwealmed and couldnt keep theyr ballance... much like mr khan's fights!! cept even they are stopped too early!!
hope this helps
peace