I'd like to know that, too. I can understand 4 and 3, but not 2 and 4. It's absolutely impossible to make an MLB schedule that makes any real sense. The math just doesn't add up. Sure you can. There are 81 home games, so that equates to 27 three-game series. Unless you had all the teams take off days on the same day, its not really that possible. And even then, your always going to have 1 team flying from the east coast to the west coast with no day of rest in between.