Pittsburgh does not have a first-place clinch number

Here is a scenario in which Pittsburgh wins all 57 of their remaining games (97 total) but does not but does not clinch first place.

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Milwaukee        63	43	56	0.594	0.0
Cincinnati       56	50	56	0.528	7.0
St. Louis        53	52	57	0.505	9.5
Chicago          51	56	55	0.477	12.5
Pittsburgh       40	65	57	0.381	22.5

Next, we show how the remaining series of games in Pittsburgh's division plays out in the scenario:

Chicago wins 2 games against Cincinnati and loses 4.
Chicago wins 7 games against Milwaukee and loses 0.
Chicago wins 0 games against Pittsburgh and loses 7.
Chicago wins 7 games against St. Louis and loses 0.
Chicago wins 28 games against teams outside the division and loses 0.

Cincinnati wins 4 games against Chicago and loses 2.
Cincinnati wins 3 games against Milwaukee and loses 0.
Cincinnati wins 0 games against Pittsburgh and loses 13.
Cincinnati wins 6 games against St. Louis and loses 0.
Cincinnati wins 28 games against teams outside the division and loses 0.

Milwaukee wins 0 games against Chicago and loses 7.
Milwaukee wins 0 games against Cincinnati and loses 3.
Milwaukee wins 0 games against Pittsburgh and loses 6.
Milwaukee wins 7 games against St. Louis and loses 6.
Milwaukee wins 27 games against teams outside the division and loses 0.

Pittsburgh wins 7 games against Chicago and loses 0.
Pittsburgh wins 13 games against Cincinnati and loses 0.
Pittsburgh wins 6 games against Milwaukee and loses 0.
Pittsburgh wins 10 games against St. Louis and loses 0.
Pittsburgh wins 21 games against teams outside the division and loses 0.

St. Louis wins 0 games against Chicago and loses 7.
St. Louis wins 0 games against Cincinnati and loses 6.
St. Louis wins 6 games against Milwaukee and loses 7.
St. Louis wins 0 games against Pittsburgh and loses 10.
St. Louis wins 21 games against teams outside the division and loses 0.

Combining the current standings with the wins and losses from the scenario results in the following final standings:
TEAM             W	L	GL	PCT
Cincinnati       97	65	0.599	0.0
Milwaukee        97	65	0.599	0.0
Pittsburgh       97	65	0.599	0.0
Chicago          95	67	0.586	2.0
St. Louis        80	82	0.494	17.0

# Pittsburgh Pirates's magic number
# Pittsburgh's magic number
# Pirates's magic number
# MLB Playoff Race