Practicing the "Exchange Slav" through a chess960 game played by Karpov
I'm a fervent believer in the great teacher Purdy's recommended method for practicing chess: playing through master games while covering up the winner's moves and guessing them as you go. When you guess right, yay, keep going. When you guess wrong, figure out why.
One hitch in this practice is the opening: If you're following a master through a closed Ruy Lopez, what's the point of "guessing" a dozen moves of theory and then saying "darn, I guessed the Flohr-Zaitsev but the grandmaster played the Breyer". For this reason, it's often suggested that the student begin guessing at move 10 or so — Pandolfini's "Solitaire Chess" feature in Chess Life gives the opening freely, for instance.
But in a chess960 game, you and the master were thinking on your own from the first move. This makes chess960 a great tool for learning how to think like a master during the opening.