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On December 18, 1932, extremely frigid conditions forced the 1932 NFL Championship game between the Chicago Bears and Portsmouth Spartans to be held indoors at Chicago Stadium.
It was the first NFL playoff game held indoors.
Because the field was smaller league officials needed to “scramble” in order to modify the rules.
Image from of Chicago Stadium via Wikimedia Commons, public domain in the US
https://heartfelthistory.com/on-this-day-in-american-history-december-18/
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