Some old movie about women being forced into death matches

Hello, friends. Maybe someone can identify this movie from this description. I did not see it, but I’d like to help some person out.
It was probably filmed in the 1970s, 1980s, or 1990s. The plot: in a post-apocalyptic world, young women were kidnapped and then matched to the death. They fought unarmed. The arena was covered with sand, and a knife was stuck into the sand (apparently at the end of the fight) so that the winner could use it to finish off her defeated opponent. The boss, sitting in a chair with his girlfriend, and the crowd watched the fights and likely placed bets. The boss forced the winner to have sex with him. The main character in the film showed mercy: after defeating her rival, she didn’t kill her. However, the film featured an evil fighter who killed her rival. In the end, the heroine revolted and escaped. She beat the evil woman and the boss’s girlfriend. She might even have killed the boss himself. To escape with the other girls.

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Maybe?:

”Phoenix the Warrior” (1988), also known as “She-Wolves of the Wasteland”

IMDb link:

https://www.imdb.com/title/tt0093731/

Plot summary on Wikipedia:

You can watch the full movie on YouTube here:

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Are you a 100 % sure about the post-apocalyptic setting?

If not:

The Arena (1974).

https://imdb.com/title/tt0069729

https://imdb.com/search/title/?title_type=feature,tv_movie&release_date=1970-01-01,2000-12-31&genres=!documentary,!short&plot=arena,women

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I think it could be Terminal Island, a 70s exploitation movie. https://youtu.be/PpZHuVQV49U?si=TMrpraHWoCOP2g7H

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