The Alphas are on par. Northern Brewer was 8.5, and the Centennial is 9.1. It's the 30 minute hop addition in a Russian Imperial Stout. I HATE to do it, but for some reason, I can't for the life of me find the Northern Brewer. I'm thinking that my friggin imaginary friend ate them(that would be the 2 kids ). I think I'll be alright. What do you think?