What's the Magic Number in Baseball?

What's the Magic Number in baseball? It's simply the number of games that the team leading a division
needs to win to ensure winning the division. If you're leading the division with ten games remaining
and your Magic Number is three, you only need to win three of those ten games to ensure winning the
division. Each time you win, your Magic Number goes down by one. Each time your nearest divisional
competitor loses, your Magic Number also goes down by one. When your Magic Number hits zero, you've
clinched the division.