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The 1945 Retro-Hugo Award winners and detailed stats can be found here.1
The 2020 Hugo Award winners and detailed stats can be found here.1
Brief comments on the 1945 Retro-Hugo Awards:
A number of these awards appear to have been voted for on name recognition (either writer or book), such as the Novelette award for City by Clifford D. Simak (the same title as the novel, and a weak piece in a strong category); the Short Story award for I, Rocket, by Ray Bradbury (beating out two other ‘City’ stories, Desertion and Huddling Place);2 the Best Related Work award for The Science-Fiction Field, by Leigh Brackett (I couldn’t find this online so wonder if anyone actually read it); and the Best Fan Writer award to Fritz Leiber (those in the know suggest Bob Tucker should have won).
Not a particularly useful set of awards.
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1. Nicholas Whyte provides detailed analysis of the stats for the 1945 and 2020 awards.
Cora Buhlert provides detailed commentary on the 1945 awards.
2. If you look at the nominations statistics, I, Rocket only just made the short list ahead of The Lake.