When they meet again in episode 5, "Fork," Beth beats Benny, further intriguing him. ... It is as if Benny only sees Beth's chess abilities, not her feelings - a problem which she also had in her relationship with Harry Beltik (Harry Melling). He is too obsessed with chess and his mentorship of Beth at this point.

Does Beth Harmon end up with Benny?

Harry leaves Beth, likely because he realizes how unhealthy it is, and Beth later exits her relationship with Benny, perhaps because she recognizes his true interest is her skill at chess (not her).

Why does Beth lose to Benny?

Because of Beth's impulsiveness to win, Benny found her mistakes and put Beth's undefeated streak to an end. She once again faced Benny at the 1967 Ohio U.S. Championship. Before the official final match, Beth played a series of speed chess in which she constantly lost to Benny.