I have been trying to identify a movie that my dad told me about once. Unfortunately since the movies SE doesn't accept story id questions anymore, I want to know if I can ask my question here. The problem is that it doesn't seem like a sci fi movie at first glance.
The plot of the movie is like this:
The United States and some nondescript Asian country are at war. Both countries decide to determine the outcome of the war by sending their top soldiers to an island in the middle of the ocean to fight each other to the death. The victor of this fight wins the war for their respective nation. However both countries secretly send an assassin to make sure they win. The soldiers find out about the assassin and kill their own country's assassin because they want to make it a fair fight (the American soldier kills the American assassin and the Asian soldier kills the Asian assassin.
The reason I don't think it is a sci fi movie is that it doesn't take place in the future, I think it actually takes place in the year the movie was made (60s - 70s probably). However, the idea that two countries will decide their war by a fight to the death between their top soldiers seems absurd, which makes me think it has elements of a sci-fi story. Sci-fi movies try to answer the question of "what if?", even answers to hypothetical questions about situations which could never happen.