Colorado Rockies First-Place Eliminiation Scenario
Colorado must win 35 more games (39 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Colorado finishes in first place with 39 wins:

Team             W	L	PCT	GB
Colorado         39	123	0.241	0.00
Arizona          38	124	0.235	1.00
Los Angeles      38	124	0.235	1.00
San Diego        38	124	0.235	1.00
San Francisco    38	124	0.235	1.00

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
San Diego        17	8	137	0.680	0.0
Los Angeles      16	9	137	0.640	1.0
San Francisco    16	9	137	0.640	1.0
Arizona          14	10	138	0.583	2.5
Colorado         4	18	140	0.182	11.5

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 4 additional game(s) against Colorado and loses 9.
Arizona loses the series 4 games to 9.
Arizona wins 0 additional game(s) against teams outside the division and loses 86.

Arizona currently has 0 win(s) against Los Angeles and 0 loss(es).
Arizona wins 13 additional game(s) against Los Angeles and loses 0.
Arizona wins the series 13 games to 0.
Arizona wins 0 additional game(s) against teams outside the division and loses 86.

Arizona currently has 0 win(s) against San Diego and 0 loss(es).
Arizona wins 0 additional game(s) against San Diego and loses 13.
Arizona loses the series 0 games to 13.
Arizona wins 0 additional game(s) against teams outside the division and loses 86.

Arizona currently has 0 win(s) against San Francisco and 0 loss(es).
Arizona wins 7 additional game(s) against San Francisco and loses 6.
Arizona wins the series 7 games to 6.
Arizona wins 0 additional game(s) against teams outside the division and loses 86.

Colorado currently has 0 win(s) against Los Angeles and 3 loss(es).
Colorado wins 8 additional game(s) against Los Angeles and loses 2.
Colorado wins the series 8 games to 5.
Colorado wins 0 additional game(s) against teams outside the division and loses 94.

Colorado currently has 0 win(s) against San Diego and 3 loss(es).
Colorado wins 7 additional game(s) against San Diego and loses 3.
Colorado wins the series 7 games to 6.
Colorado wins 0 additional game(s) against teams outside the division and loses 94.

Colorado currently has 0 win(s) against San Francisco and 0 loss(es).
Colorado wins 11 additional game(s) against San Francisco and loses 2.
Colorado wins the series 11 games to 2.
Colorado wins 0 additional game(s) against teams outside the division and loses 94.

Los Angeles currently has 0 win(s) against San Diego and 0 loss(es).
Los Angeles wins 12 additional game(s) against San Diego and loses 1.
Los Angeles wins the series 12 games to 1.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 88.

Los Angeles currently has 0 win(s) against San Francisco and 0 loss(es).
Los Angeles wins 8 additional game(s) against San Francisco and loses 5.
Los Angeles wins the series 8 games to 5.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 88.

San Diego currently has 0 win(s) against San Francisco and 0 loss(es).
San Diego wins 4 additional game(s) against San Francisco and loses 9.
San Diego loses the series 4 games to 9.
San Diego wins 0 additional game(s) against teams outside the division and loses 88.

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