Answer:
At the cost of the friendship with his friends and family
Explanation:
A proper theme of the story from the excerpt is that winning is not everything. Barry resorted to dubious ways to win the board games. His love for winning made him do many bad things just to win. These included stealing from the bank, cheating in the game by skipping spaces when moving around the board, and shortchanging others of their money.
He was warned by his friends to desist from such acts but he simply refused. In time they all stopped playing with him. So, Barry's love for winning overshadowed him and made him sacrifice his friendship with his friends and family.