Divine Angel said:

chatGPT said:
The line “It has to be Amberezzio” is from Field of Thirteen by Dick Francis.

Amberezzio is a racehorse in the story. The novel is a collection of thirteen Dick Francis short stories, and the Amberezzio story involves journalist Fred working around horse racing, gambling and a race fix.

Interestingly, “Amberezzio” is an unusual name, which is probably why that line stuck in your memory. I found the name independently listed as an Italian surname as well, but the book reference is definitely associated with Dick Francis’s Field of Thirteen.

ChatGPT is wrong; Amberezzio is the jockey on the winning horse. The other details were right, though. Field of Thirteen is not a novel, but a collection of (thirteen of) Francis’s short stories, which includes The Gift. Francis was a Welsh jockey (who rode horses for the Queen Mother for 8 years) and author, most of whose stories involve horse racing.