To me Fair Chase is where the animal has the advantage to elude the hunter. Years ago I hunted a ranch in the Texas Hill Country, about 1,500 acres, with a high fence around it. In a week, I did not see the fence but twice. The deer had the ability to elude us with ease. I would have classed this as Fair Chase. Now, a 5 acre fenced enclosure or 50 acres, NOT Fair Chase.
Just my opinion.
Garo