Given the incredibly well-documented history of professional chess, learning during play isn't efficient. If you're going up against a player, just program ever

Given the incredibly well-documented history of professional chess, learning during play isn't efficient. If you're going up against a player, just program every game they've ever played professionally into the system to study their behavior. You can be sure the human players do something similar. Heck, I'm fairly certain that every master game ever recorded was shoved into Deep Blue and other high-end chess programs.