Houston Astros First-Place Elimination Scenario
Houston must win 0 more games (81 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Houston finishes in first place with 81 wins:

Team             W	L	PCT	GB
Houston          81	81	0.500	0.00
Texas            80	82	0.494	1.00
Seattle          76	86	0.469	5.00
Oakland          64	98	0.395	17.00
LAAngels         62	100	0.383	19.00

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Houston          81	81	0	0.500	0.0
Texas            80	82	0	0.494	1.0
Seattle          76	86	0	0.469	5.0
Oakland          64	98	0	0.395	17.0
LAAngels         62	100	0	0.383	19.0

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

Houston currently has 7 win(s) against LAAngels and 6 loss(es).
Houston and LAAngels have no remaining games.
Houston wins the series 7 games to 6.
Houston wins 0 additional game(s) against teams outside the division and loses 0.

Houston currently has 7 win(s) against Oakland and 6 loss(es).
Houston and Oakland have no remaining games.
Houston wins the series 7 games to 6.
Houston wins 0 additional game(s) against teams outside the division and loses 0.

Houston currently has 3 win(s) against Seattle and 10 loss(es).
Houston and Seattle have no remaining games.
Houston loses the series 3 games to 10.
Houston wins 0 additional game(s) against teams outside the division and loses 0.

Houston currently has 9 win(s) against Texas and 4 loss(es).
Houston and Texas have no remaining games.
Houston wins the series 9 games to 4.
Houston wins 0 additional game(s) against teams outside the division and loses 0.

LAAngels currently has 5 win(s) against Oakland and 8 loss(es).
LAAngels and Oakland have no remaining games.
LAAngels loses the series 5 games to 8.
LAAngels wins 0 additional game(s) against teams outside the division and loses 0.

LAAngels currently has 6 win(s) against Seattle and 7 loss(es).
LAAngels and Seattle have no remaining games.
LAAngels loses the series 6 games to 7.
LAAngels wins 0 additional game(s) against teams outside the division and loses 0.

LAAngels currently has 8 win(s) against Texas and 5 loss(es).
LAAngels and Texas have no remaining games.
LAAngels wins the series 8 games to 5.
LAAngels wins 0 additional game(s) against teams outside the division and loses 0.

Oakland currently has 7 win(s) against Seattle and 6 loss(es).
Oakland and Seattle have no remaining games.
Oakland wins the series 7 games to 6.
Oakland wins 0 additional game(s) against teams outside the division and loses 0.

Oakland currently has 7 win(s) against Texas and 6 loss(es).
Oakland and Texas have no remaining games.
Oakland wins the series 7 games to 6.
Oakland wins 0 additional game(s) against teams outside the division and loses 0.

Seattle currently has 5 win(s) against Texas and 8 loss(es).
Seattle and Texas have no remaining games.
Seattle loses the series 5 games to 8.
Seattle wins 0 additional game(s) against teams outside the division and loses 0.

# Houston Astros' magic number
# Houston's magic number
# Astros' magic number
# MLB Playoff Race