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'Hazard' came from a dice game

Arabic az-zahr meant dice. The medieval game of hazard gave English a word for risk itself.

In 2016 AlphaGo played a move human experts called a mistake. It won the game — and changed how professionals understood a 2,500-year-old game.

The number of possible chess games is estimated around 10^120 — vastly more than the roughly 10^80 atoms in the observable universe.