Pretty straight forward question. I am curious to know what "baseline" means in the rule book. A player on our team was called out today for avoiding a tag running out a soft grounder along the first baseline. 1B fielded the ball and attempted to apply the tag but our runner swerved around the tag while running towards first base. She was called out for running outside the baseline. But what is actually the baseline? Our first base coach watched the play as she was running towards first base and he said that the runner took one big stride to the right to avoid the tag. The first basemen missed the tag, but runner was called out.