If Masticator has been killed, the Chosen One will face Xander Holyland instead. [verification needed]
The numbers are given assuming that the Chosen One gets 50% of the winnings; with Speech 76% and Barter 76% the Chosen One can get 75% instead. They would also get any corresponding kill experience if they happen to beat a boxer to death; the announcer would count this as a knockout. Other ways of winning include:
Knockout (scoring a Critical Hit that knocks the opponent unconscious or if they get a critical failure with the same effect),
Technical knockout (making them flee), and
Points (somehow managing to make a fight last 12 full rounds and win the majority of them by landing more punches than the opponent).
In a fight, only punching the opponent with the gloves is allowed; any other attack would get the character disqualified. Likewise, the bonus from Buffout immediately expires (i.e. is advanced to the penalty stage) at the start of a fight.
Upon winning all four matches, the Chosen One is awarded the Prizefighter reputation title, which also allows them to loot the gym lockers without the inhabitants stopping them.
If the Chosen One loses a fight, they must ask Little for a rematch immediately or they won't get another chance. They will then go up against another boxer and the royalties will drop to 25%, but the XP gained is the same. Little can only be convinced once (unless a bug is exploited), which means the Chosen One can fight five matches in total (for which, there is a reason if the player wishes to abuse yet another bug, see notes below).
At the start of every match, if the Chosen One has either kind of gloves, they get a permanent +3 bonus to Damage Threshold for normal damage (to a maximum of 100), -1 for plasma and explosive damage, and a bonus to Damage Resistance (DR) for each listed damage type except fire (to a maximum of 90%). If Chosen One only has normal gloves, they get +1% DR for all four types, but if Chosen One has plated ones, they get +2% for normal damage, +5% for laser damage and +1% for the others (there's also a -1% penalty to Chosen One's unlisted EMP resistance, but this doesn't matter in the least; the electricity resistance is unaffected).
The Chosen One get to keep these bonuses even after losing a match. Therefore, in the fourth match, the Chosen One can kick the opponent, ask Stuart Little for another shot, then win the final match (the Masticator's replacement is significantly weaker and doesn't bite) to get a fifth toughness bonus.
The bonus from boxing match is considered as a bug that add weapon attributes to the DT/DR. For example, the normal DT comes from action point cost, laser DR from max damage (therefore 5 for plated gloves, while 1 from normal gloves).
Switching to kicking or dealing a blow without the boxing gloves results in disqualification.
If the Chosen One keeps fighting and has an Unarmed skill at about 160% or higher, they may end up biting off the Masticator's ear.
The Masticator can also bite the Chosen One's ear - reducing Charisma by 1 and adds the ear in inventory.
A Chosen One with an Intelligence below 4 can box providing they are male and have a Strength of 6. Aside from getting no pay and no rematch, things work the same. Female characters or male characters with a Strength below 6 have to persuade Stuart Little to box.
If the Masticator is too difficult to defeat, it is possible to go in the basement of Shark Club and kill him there for 1000 XP though losing 5 Karma. However, he will be replaced with Xander Holyland in the ring.