In the November 1979 issue of Word Ways we exhibited a 2064-point single-move Scrabble score using open sources. This was an improvement on an earlier 2037-point effort devised by Josefa Heifetz, better known as Josefa Heifetz Byrne, compiler of the famous Mrs. Byrne's Dictionary of Unusual, Obscure and Preposterous Words (1974). Both moves are based on the elusive term SESQUIOXIDIZING, which is not specifically indicated in any dictionary. The closest approach is the past participle SESQUIOXIDIZED, which appears in OED.
"A 2152-Point Scrabble Move,"
Word Ways: Vol. 43
, Article 9.
Available at: https://digitalcommons.butler.edu/wordways/vol43/iss2/9