This script solves the problem discussed on Effectively Wild episode 1997: what's the longest streak of games where two teams experienced the same sequence of wins and losses?
The script reads Retrosheet game logs data,
and accepts two arguments to limit the minimum and maximum size of spans to consider,
although this does not prove necessary in practice: on the full Retrosheet data set, it completes
in about 19 seconds on a Mac M1 Pro. Passing "modern" as the third argument
excludes 19th century seasons.
35218567 total spans
Longest match: 36 games - [[1890 PIT games 78-113, 1875 BR2 games 1-36]]
Total execution time 18924ms
32739105 total spans
Longest match: 35 games - [[1997 PHI games 59-93, 2011 FLO games 49-83]]
Total execution time 17832ms