When I was growing up, we had a ping-pong table in the basement and I spent a good deal of time playing my father. We used a sliding handicap. I started with some number of points. Every time I lost my starting score went up by one point for the next game, every time I won it went down. Gradually, over the years, it crept down to zero.
This is how I’d do it, too. I’ve also used a similar technique for modifying the prices of certain buildings in a board game I enjoy.
Can I have my Nobel, please?