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Bob Blue’s table tennis opponent never gets offended by his trash talking. That’s one of the many upsides of playing against a robot.

Mr. Blue, 61, grew up in a family of table tennis fanatics and played avidly with friends through high school. It wasn’t until 2007, when his wife died, that he thought to dust off his paddle again. “I turned to exercise as a way of coping,” he says.

As the founding winemaker of Bonterra…