Article date: Sep 1976
Article title: John Horton Conway's book covers an infinity of games
Mathematical Games column? Y
Book: 13. Penrose Tiles to Trapdoor Ciphers
Chapter: 4. Conway's Surreal Numbers
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (4 November 2023):
I have seen this chapter and column side-by-side and they match.