Another major league start is in the books for Atlanta Braves rookie JR Ritchie. He went 4 1/3 innings, allowing an earned run on two hits and three walks while striking out four.  By his nature, there is frustration that he didn’t pitch deeper into the game. There’s always the goal of going seven innings. A tough Cubs lineup forced him to battle in some key at-bats, running up his pitch count early.  However, he showed further signs of taking another step forward.  His breaking pitches were effective again, notably the changeup. It wasn’t the pitch that got him the most strikeouts - that was the curveball - but he felt he had better command of the pitch, allowing him to better utilize it.  “When I have good feel for it, I’m throwing it to both sides,” he said. “...tonight was the first night in a while that I felt really good, confident enough to throw it to righties, and it worked out.”  That confidence in this pitch paid off in certain matchups.…