Win Probability: 1974
Good news! We have 1974 play-by-play data with all usual goodies including all 1,945 game graphs and the leaderboards.
And I bet you thought that 22 inning game was long:

David Appelman is the creator of FanGraphs.

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In 1974 every Cubs starter had a negative WPA. Must’ve been a long summer.
Does 1974 WPA use a different win probability table? I gotta think a 2 run lead in ’74 was bigger than a 2 run lead now.
It still uses Tangotiger’s win probability tables, but the run environment is scaled down, so the change in run environment is reflected in the data.