Colorado Rockies First-Place Eliminiation Scenario
Colorado must win 26 more games (33 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Colorado finishes in first place with 33 wins:

Team             W	L	PCT	GB
Colorado         33	129	0.204	0.00
San Diego        33	129	0.204	0.00
Arizona          32	130	0.198	1.00
Los Angeles      32	130	0.198	1.00
San Francisco    32	130	0.198	1.00

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      16	11	135	0.593	0.0
San Diego        14	14	134	0.500	2.5
Arizona          12	14	136	0.462	3.5
San Francisco    12	14	136	0.462	3.5
Colorado         7	19	136	0.269	8.5

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

Arizona currently has 5 win(s) against Colorado and 2 loss(es).
Arizona wins 2 additional game(s) against Colorado and loses 4.
Arizona wins the series 7 games to 6.
Arizona wins 0 additional game(s) against teams outside the division and loses 95.

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 95.

Arizona currently has 0 win(s) against San Diego and 0 loss(es).
Arizona wins 5 additional game(s) against San Diego and loses 8.
Arizona loses the series 5 games to 8.
Arizona wins 0 additional game(s) against teams outside the division and loses 95.

Arizona currently has 2 win(s) against San Francisco and 2 loss(es).
Arizona wins 0 additional game(s) against San Francisco and loses 9.
Arizona loses the series 2 games to 11.
Arizona wins 0 additional game(s) against teams outside the division and loses 95.

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 1 additional game(s) against teams outside the division and loses 94.

Colorado currently has 2 win(s) against San Diego and 2 loss(es).
Colorado wins 5 additional game(s) against San Diego and loses 4.
Colorado wins the series 7 games to 6.
Colorado wins 1 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 8 additional game(s) against San Francisco and loses 5.
Colorado wins the series 8 games to 5.
Colorado wins 1 additional game(s) against teams outside the division and loses 94.

Los Angeles currently has 2 win(s) against San Diego and 3 loss(es).
Los Angeles wins 5 additional game(s) against San Diego and loses 3.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 91.

Los Angeles currently has 3 win(s) against San Francisco and 0 loss(es).
Los Angeles wins 6 additional game(s) against San Francisco and loses 4.
Los Angeles wins the series 9 games to 4.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 91.

San Diego currently has 3 win(s) against San Francisco and 4 loss(es).
San Diego wins 4 additional game(s) against San Francisco and loses 2.
San Diego wins the series 7 games to 6.
San Diego wins 0 additional game(s) against teams outside the division and loses 98.

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