You need to 60 Rated Wins to unlock every Chess Set in Chessmaster 10th Edition, the strat I have come up with involves beating Pete (rated 37) 60 times. This strategy takes advantage of the fact that Pete really likes making pawn moves, particularly those on the edge of the board.

This method will work 100% of the time as Pete seems to play the exact same way every time, there is a weaker opponent named Cassie but she sometimes plays "random" moves and can mess up our move order as a result.

Here is a PGN containing all the moves: https://lichess.org/545tFz6F

Before starting, make sure you set up the board how you want, I recommended turning off 'Sliding Pieces' to skip their animations and to turn on 'Quick Entry'.