Colorado Rockies First-Place Elimination Scenario
Colorado must win 25 more games (41 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Colorado finishes in first place with 41 wins:

Team             W	L	PCT	GB
Colorado         41	121	0.253	0.00
San Diego        41	121	0.253	0.00
Arizona          40	122	0.247	1.00
Los Angeles      40	122	0.247	1.00
San Francisco    39	123	0.241	2.00

Tie breakers
Colorado wins the series with San Diego 7 games to 6

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Los Angeles      24	15	123	0.615	0.0
San Diego        23	16	123	0.590	1.0
Arizona          18	20	124	0.474	5.5
Colorado         16	24	122	0.400	8.5
San Francisco    15	24	123	0.385	9.0

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 13 additional game(s) against Colorado and loses 0.
Arizona wins the series 13 games to 0.
Arizona wins 0 additional game(s) against teams outside the division and loses 77.

Arizona currently has 0 win(s) against Los Angeles and 3 loss(es).
Arizona wins 7 additional game(s) against Los Angeles and loses 3.
Arizona wins the series 7 games to 6.
Arizona wins 0 additional game(s) against teams outside the division and loses 77.

Arizona currently has 1 win(s) against San Diego and 1 loss(es).
Arizona wins 0 additional game(s) against San Diego and loses 11.
Arizona loses the series 1 games to 12.
Arizona wins 0 additional game(s) against teams outside the division and loses 77.

Arizona currently has 0 win(s) against San Francisco and 0 loss(es).
Arizona wins 2 additional game(s) against San Francisco and loses 11.
Arizona loses the series 2 games to 11.
Arizona wins 0 additional game(s) against teams outside the division and loses 77.

Colorado currently has 2 win(s) against Los Angeles and 2 loss(es).
Colorado wins 9 additional game(s) against Los Angeles and loses 0.
Colorado wins the series 11 games to 2.
Colorado wins 0 additional game(s) against teams outside the division and loses 81.

Colorado currently has 1 win(s) against San Diego and 6 loss(es).
Colorado wins 6 additional game(s) against San Diego and loses 0.
Colorado wins the series 7 games to 6.
Colorado wins 0 additional game(s) against teams outside the division and loses 81.

Colorado currently has 0 win(s) against San Francisco and 0 loss(es).
Colorado wins 10 additional game(s) against San Francisco and loses 3.
Colorado wins the series 10 games to 3.
Colorado wins 0 additional game(s) against teams outside the division and loses 81.

Los Angeles currently has 0 win(s) against San Diego and 0 loss(es).
Los Angeles wins 13 additional game(s) against San Diego and loses 0.
Los Angeles wins the series 13 games to 0.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 81.

Los Angeles currently has 1 win(s) against San Francisco and 2 loss(es).
Los Angeles wins 0 additional game(s) against San Francisco and loses 10.
Los Angeles loses the series 1 games to 12.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 81.

San Diego currently has 3 win(s) against San Francisco and 3 loss(es).
San Diego wins 7 additional game(s) against San Francisco and loses 0.
San Diego wins the series 10 games to 3.
San Diego wins 0 additional game(s) against teams outside the division and loses 86.

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