Here’s a more or less up-to-date list of my external web writings.
For uschess.org
Author page:
https://new.uschess.org/author/john-hartmann/
The Gift of Chess: Hartmann’s Holiday Shopping Guide (December 2017)
How to Play against 1.e4 – Chess Life Web Extra (May 2017)
Chess Tech University: Philosophy & Game Analysis (March 2017)
Part I
https://new.uschess.org/news/chess-tech-university-philosophy-game-analysis-part-1/
Part II
https://new.uschess.org/news/chess-tech-university-philosophy-game-analysis-part-2/
Five Chess Tech Tips for the New Year (January 2017)
Part I
https://new.uschess.org/news/five-chess-tech-tips-for-the-new-year-part-1/
Part II
https://new.uschess.org/news/five-chess-tech-tips-for-the-new-year-part-2/
For chessbase.com
Author page:
https://en.chessbase.com/author/john-hartmann
Diving Into Databases (December 2015)
https://en.chessbase.com/post/john-hartmann-diving-into-databases
And then there were two… (June 2015)
https://en.chessbase.com/post/john-hartmann-and-then-there-were-two
Lucky Number 13? (November 2014)
https://en.chessbase.com/post/new-chessbase-program-lucky-number-13
Choosing a Chess Engine (September 2014)
http://en.chessbase.com/post/hartmann-choosing-a-chess-engine