Colorado Rockies First-Place Eliminiation Scenario
Colorado must win 27 more games (27 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Colorado finishes in first place with 27 wins:

Team             W	L	PCT	GB
Colorado         27	135	0.167	0.00
San Francisco    27	135	0.167	0.00
Los Angeles      27	135	0.167	0.00
San Diego        26	136	0.160	1.00
Arizona          25	137	0.154	2.00

Tie breakers
Colorado wins the series with Los Angeles 8 games to 5
Colorado wins the series with San Francisco 12 games to 1

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Arizona          0	0	162	0.000	0.0
Colorado         0	0	162	0.000	0.0
Los Angeles      0	0	162	0.000	0.0
San Diego        0	0	162	0.000	0.0
San Francisco    0	0	162	0.000	0.0

Next, we show how the remaining series of games plays out in the scenario:

Arizona currently has 0 win(s) against Colorado and 0 loss(es).
Arizona wins 6 additional game(s) against Colorado and loses 7.
Arizona loses the series 6 games to 7.
Arizona wins 0 additional game(s) against teams outside the division and loses 110.

Arizona currently has 0 win(s) against Los Angeles and 0 loss(es).
Arizona wins 0 additional game(s) against Los Angeles and loses 13.
Arizona loses the series 0 games to 13.
Arizona wins 0 additional game(s) against teams outside the division and loses 110.

Arizona currently has 0 win(s) against San Diego and 0 loss(es).
Arizona wins 6 additional game(s) against San Diego and loses 7.
Arizona loses the series 6 games to 7.
Arizona wins 0 additional game(s) against teams outside the division and loses 110.

Arizona currently has 0 win(s) against San Francisco and 0 loss(es).
Arizona wins 13 additional game(s) against San Francisco and loses 0.
Arizona wins the series 13 games to 0.
Arizona wins 0 additional game(s) against teams outside the division and loses 110.

Colorado currently has 0 win(s) against Los Angeles and 0 loss(es).
Colorado wins 8 additional game(s) against Los Angeles and loses 5.
Colorado wins the series 8 games to 5.
Colorado wins 0 additional game(s) against teams outside the division and loses 110.

Colorado currently has 0 win(s) against San Diego and 0 loss(es).
Colorado wins 0 additional game(s) against San Diego and loses 13.
Colorado loses the series 0 games to 13.
Colorado wins 0 additional game(s) against teams outside the division and loses 110.

Colorado currently has 0 win(s) against San Francisco and 0 loss(es).
Colorado wins 12 additional game(s) against San Francisco and loses 1.
Colorado wins the series 12 games to 1.
Colorado wins 0 additional game(s) against teams outside the division and loses 110.

Los Angeles currently has 0 win(s) against San Diego and 0 loss(es).
Los Angeles wins 7 additional game(s) against San Diego and loses 6.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 2 additional game(s) against teams outside the division and loses 108.

Los Angeles currently has 0 win(s) against San Francisco and 0 loss(es).
Los Angeles wins 0 additional game(s) against San Francisco and loses 13.
Los Angeles loses the series 0 games to 13.
Los Angeles wins 2 additional game(s) against teams outside the division and loses 108.

San Diego currently has 0 win(s) against San Francisco and 0 loss(es).
San Diego wins 0 additional game(s) against San Francisco and loses 13.
San Diego loses the series 0 games to 13.
San Diego wins 0 additional game(s) against teams outside the division and loses 110.

# Colorado Rockies' magic number
# Colorado's magic number
# Rockies' magic number
# MLB Playoff Race