> this is an improvement, but not an exponential one. I wonder how you define exponential here. If the old version had a probability 20% of losing against Lee

> this is an improvement, but not an exponential one. I wonder how you define exponential here. If the old version had a probability 20% of losing against Lee Sedol, and the new one has 5%, then one might call it exponential. Something like losing prob = 2^(2012-current year).