The Infinity Machine by Sebastian Mallaby review – the story of the man who changed the world

A journalist charts the progress of AI pioneer Demis Hassabis from child chess prodigy to Nobel prize winner

It was March 2016, and at the Four Seasons Hotel in Seoul, the world was gathered to watch the culmination of a battle 2,500 years in the making. On one side was the South Korean Lee Se-dol, the second-highest ranking Go player in the world. On the other was AlphaGo – a computer program developed by London-based artificial intelligence research company DeepMind.

“Chess is the greatest game mankind has invented,” game designer Alex Randolph once said. “Go is the greatest game mankind has discovered.” Something about the ancient Chinese duel, where players place stones on a grid, trying to capture territory, feels fundamental – inevitable, even. Chess had fallen to the robots nearly 20 years earlier, when DeepBlue beat Kasparov, but Go, with its vast decision space (there are far more legal board positions than atoms in the observable universe) remained a plucky holdout.