Mallory's romantic interest, a brilliant and wealthy young man, who respects her independence and encourages her to return to chess after witnessing her talent.

Mallory's mother who struggles with rheumatoid arthritis, often unable to work, which forces Mallory to take on responsibilities to support the family.

Mallory's rebellious fourteen-year-old sister who challenges Mallory's authority at home and struggles with changes in their relationship.

The youngest Greenleaf sister who admires Mallory for her chess skills and looks up to her.

Mallory's best friend who persuades her to join a charity chess tournament, sparking the events of the story.

Owner of the Zugzwang chess club and former Grandmaster, who provides support and guidance to Mallory during her fellowship.

A Grandmaster at the Zugzwang club and possibly Defne’s romantic partner, offering Mallory support and friendship.

Nolan’s friends who are professional chess players attending college and help create a supportive circle for Mallory at tournaments.

The antagonist, a misogynistic chess player in the professional circuit, known for his unethical behaviors during matches.