The phrase "human opponents" refers to people who compete or play against each other in a game or competition, rather than facing computers or artificial intelligence. Full definition
Playing against human opponents naturally offers a different type of challenge, but there's nothing here that hasn't been done in other recent iterations in the series. (videochums.com)
It actually resembles the single player game, but with human opponents instead of AI. (ztgd.com)
The game itself is fine and could be exciting when played against a full compliment of human opponents but that's a guarantee the game can't make. (darkstation.com)