My friend and i usually flip a quarter to see who buys lunch. Since i won the last three lunches in a row i told my friend we would do the next coin flip as follows to give him an advantage. I would like to know if he really does have an advantage and if so what % advantage does he have. Here is the play. My friend takes heads and I tails. We continue to flip the quarter until either my friend gets ahead of me by 2 or i get ahead of him by three. This could take several flips of the quarter until he has an advantage of 2 over me or i have gained an advantage of 3 over him. Is there someone out there that could confirm that my friend has an advantage and what % that would be?