I'm not aware of the Brittany Booker story, so I can't say exactly who she is. She could be a student with a great academic achievement story, or a young professional who overcame challenges in her career. There are so many possibilities without more information about this story.
Brittany is the main character in the story. She is the one who decides to run a marathon, which sets off the whole plot of her journey of self - improvement and discovery.
Beth Thomas in the story is a girl who had experienced early childhood abuse. She was then adopted and became known for her very difficult and disturbing behaviors such as harming animals and being overly aggressive towards people.
Since we don't have much information, Beth Anderson could be the author or the main character of this 'never - ending story'. Maybe she's a creative individual who has a lot to share through this story.
Maybe Saoirse Ronan for Brittany. She's a very talented actress who can portray strong and complex female characters. And for Alex, Ansel Elgort could be a possibility. He has the looks and the acting skills to play a character like Alex, especially if the character has a bit of a rebellious side.
Yes, Beth Harmon is a fictional character from the novel 'The Queen's Gambit' by Walter Tevis, not a real - life person. However, the story was inspired by the world of chess and the experiences of real chess players to some extent.