From the Atlantic: http://www.theatlantic.com/entertainment/archive/2014/08/why-pete-rose-still-cant-be-absolved/378866/
Rose’s betting slips, written in his own handwriting, as well as other evidence, indicate that he only bet on certain Reds’ games.
Why does that matter? He may not have been betting on all the games, but he still wanted to win every game.
It matters for two reasons. First, when Rose did not bet on the Reds, his inaction was a signal to his bookies that he wasn’t very confident in that game. Those bookies may have used this inside information to place a bet against the Reds. This doesn’t mean the game was fixed, but is reflective of Rose’s state of mind. He was compromised. Second, his wager on certain games, but not others, may have influenced the way he made decisions as a manager.
What do you mean?
If he had a wager on that night’s game, he could be more inclined to burn through his bullpen in a less-than-optimal way. He may have used pinch hitters and pinch runners differently. In an all-out-effort to win a single wagered-upon game, he could, in turn, be sacrificing the team’s chances in a number of future games. Similarly, in games where he didn’t bet at all, he may rest certain players so they are fresh in the next game, when he was wagering on the Reds.