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

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

Tie breakers
San Francisco wins the series with Arizona 7 games to 6
San Francisco wins the series with Los Angeles 7 games to 6
San Francisco 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
Colorado         1	0	161	1.000	0.0
Los Angeles      1	0	161	1.000	0.0
Arizona          0	1	161	0.000	1.0
San Diego        0	1	161	0.000	1.0
San Francisco    0	1	161	0.000	1.0

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 1 additional game(s) against teams outside the division and loses 109.

Arizona currently has 0 win(s) against Los Angeles and 1 loss(es).
Arizona wins 6 additional game(s) against Los Angeles and loses 6.
Arizona loses the series 6 games to 7.
Arizona wins 1 additional game(s) against teams outside the division and loses 109.

Arizona currently has 0 win(s) against San Diego and 0 loss(es).
Arizona wins 1 additional game(s) against San Diego and loses 12.
Arizona loses the series 1 games to 12.
Arizona wins 1 additional game(s) against teams outside the division and loses 109.

Arizona currently has 0 win(s) against San Francisco and 0 loss(es).
Arizona wins 6 additional game(s) against San Francisco and loses 7.
Arizona loses the series 6 games to 7.
Arizona wins 1 additional game(s) against teams outside the division and loses 109.

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

Colorado currently has 1 win(s) against San Diego and 0 loss(es).
Colorado wins 12 additional game(s) against San Diego and loses 0.
Colorado wins the series 13 games to 0.
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 8 additional game(s) against San Francisco 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.

Los Angeles currently has 0 win(s) against San Diego and 0 loss(es).
Los Angeles wins 5 additional game(s) against San Diego and loses 8.
Los Angeles loses the series 5 games to 8.
Los Angeles wins 1 additional game(s) against teams outside the division and loses 109.

Los Angeles currently has 0 win(s) against San Francisco and 0 loss(es).
Los Angeles wins 6 additional game(s) against San Francisco and loses 7.
Los Angeles loses the series 6 games to 7.
Los Angeles wins 1 additional game(s) against teams outside the division and loses 109.

San Diego currently has 0 win(s) against San Francisco and 0 loss(es).
San Diego wins 6 additional game(s) against San Francisco and loses 7.
San Diego loses the series 6 games to 7.
San Diego wins 1 additional game(s) against teams outside the division and loses 109.

# San Francisco Giants' magic number
# San Francisco's magic number
# Giants' magic number
# MLB Playoff Race