Millennium has a range of other options. The M828 ($679) gives you a 40-cm or 15.75-inch electronic board and chess computer but requires the Chesslink module M822 ($89) for online play. There’s also ...

The original version of this story appeared in Quanta Magazine. When Covid-19 sent people home in early 2020, the computer scientist Tom Zahavy rediscovered chess. He had played as a kid and had ...