This is the very first of a staple strip-type of Peanuts throughout its history, Charlie Brown the pitcher interacts with a member of his team who has come up to talk to him during a lull in the game. It even has Charlie Brown's usual expression of annoyance at having to put up with one of his teammates. It is missing the pitcher's mound, but that's fairly minor.
This is also, to my memory, the first time Schroeder has been catcher, which pretty much becomes his set role on the team.
