Depends on how strong your opponent is.
If you play Harry Hacker from the Midilton chess club with a rating of 1300 you may make a lot of mistakes and win.
If you play a master one mistake will probably finish you.
As you get stronger you will notice a mistake can be very subtle.
Can one mistake cause a person to eventually lose a game? Or does it take a string of mistakes? Can you recover from a mistake?