Matt Tucker, matt@playstrategy.org is one of the developers of the open source website for 2 player strategy games that is PlayStrategy: https://playstrategy.org/
Two other are: Etan Jonathan Ilfeld, ilfeld@gmail.com, and James Heppell, james@playstrategy.org
According to Matt Tucker,
“American/English
under Draughts. Whilst the site has a fair few active users (over 100 per day),
it can be difficult to find someone to play a given variant at any given moment.
To test the game play, you could try challenging one of our Featured Bots: https://playstrategy.org/
Play Checkers at PlayStrategy.org