@afreytes Unfortunately in German: This person collected 127 pages of fictional works around chess https://de.scribd.com/document/406706851/Schach-in-Der-Literatur I didn't find one that mentions "Regen" (rain) and the only one marked as "Kurzgeschichte" (short story) is not yours so it's not super likely it's in there, but just in case you want to check