Conel Hugh O'Donel Alexander (1909–1974), British chess player and cryptanalyst
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Arthur Francis O'Donel Alexander (1896–1971) was an English amateur astronomer and author.
He tied for first at the 1929/30 Hastings Premier Reserves alongside George Koltanowski ahead of Salo Flohr, Josef Rejfiř, Ludwig Rellstab, C.H.O'D. Alexander, Daniël Noteboom, and Milan Vidmar.