Article date: Jan 1972
Article title: How to triumph at nim by playing safe, and John Horton Conway's game "Hackenbush"
Mathematical Games column? Y
Book: 10. Wheels, Life, and Other Mathematical Amusements
Chapter: 14. Nim and Hackenbush
This data confirmed? yes
Notes
Peter Rowlett (27 August 2022):
Peter Rowlett initial guess (Uncertain)
Peter Rowlett (30 October 2023):
I have seen this chapter and column side-by-side and they match.