If boxing were to have countless rounds until someone gets stopped

[STEELHEAD]

If this happened guys who were extremely heavy handed with good chins would be the guys who would be on top.

you'd get some runners too.

[gingerbreadman]

This is purely a stamina issue. Runners and counterpunchers would dominate. Any boxer who is exhausted and barely able to come to the mark can be hurt and knocked down. The knockout as we know it only really started to enter boxing after the 15 round limit was introduced and gloves came in. If we took away round limits, we'd go back to the attritional fights of the 1800s, where people broke their hands all the time.