I was skimming the Deep Blue overview paper and on page 242 it says: "The search control does not really implement the regular αβ search algorithm. Rather it implements a minimum-window αβ search algorithm. This eliminates the need for value stack." I know the basics of alpha beta pruning/search, but couldn't find any reference to minimum-window αβ search algorithm online. Does the algorithm go by a different name nowadays that I might be able to look up somewhere ?