I was thinking about game I played about 20 years ago and one came to my mind. It was probably out around the same time as 4D boxing, but was a lot less of a simulation and more like Punch Out.
The main thing I remember is that you could “cheat” by waiting for the three judges to turn away and not look. When they were not looking, you could wind up a cheap shot and hit your opponent in the groin, giving you free shots while he recovered.
You literally spun around slowly winding up your cheap shot, by the way.
The rest was rather like Punch Out, with a list of increasingly harder opponents until you won the championship. I believe they final guy even looked like Mike Tyson.
Right now they’re sorted by platform, but by clicking the top columns you can sort by “Release Date”, etc.
Based on your description it sounds like it may be an abandonware title named “Low Blow”
One of the screenshots there show a newspaper sports page describing how a “fight turned dirty”, and the “judges are being investigated”. It also gives “Slick tips on how not to get caught”.
Abandonware is a term specifically used for software that has not officially been made free. The legality is hard to specify as, if it has truly been abandoned, the people who could sue you won’t. But sometimes it turns out that the abandonware wasn’t really abandoned after all.