A Fistful of Dollars is a great movie if you want to see how to play both sides against the middle and the Man with no name's ambiguous state as neither good or bad guy is great
Now if you'd like to see the movies that inspired these three movies then watch the Samurai series Yojimbo with Toshiro Mifune

Sorry is my miss-spent collage days as a liberal arts major showing or could it be that I love watching movies and learning about them?