"Midnight by the Morphy Watch" is a horror fiction story about chess, written by American author Fritz Leiber.
The story is one of a series of works by Leiber whose settings are places that he inhabited, and whose protagonists are based on himself.
[1] When amateur chessplayer Stirf Ritter-Rebil (a "quasi-anagrammatic" version of "Fritz Reuter Leiber")[1] purchases the custom-made pocket watch which once belonged to Paul Morphy, his own chess skills are supernaturally boosted — but he also begins to experience side effects.
"Midnight by the Morphy Watch" was a finalist for the 1975 Hugo Award for Best Novelette,[2] and was ranked ninth in the 1975 Locus Award for Best Short Story.
[3] Mike Ashley called it "chilling".