Ever since he beat the greatest chess player who ever lived, Hans Niemann has been called a cheat. The 19-year-old’s surprising victory over Magnus Carlsen in St. Louis on September 4 led to ...

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 ...