The rematch between former champion Jack Dempsey and the current champion Gene Tunney took place September 22, 1927 at Soldier Field in Chicago, Illinois. With an estimated 104,000 in attendance and a record-breaking $2,658,600 at the gate, Dempsey had hopes of regaining the world heavyweight championship.
There were 3 key points that were different for this bout:
1. The fight would go 10 rounds instead of the usual 12.
2. The size of the ring was 20 feet as opposed to the normal 16 feet.
3. After a knockdown, the fighter on his feet must retreat to a neutral corner before the referee could start the count.