Forty years after the movie WarGames showed the threat of a computer-driven nuclear holocaust, war-gaming has come to prominence as a way to foreshadow – and possibly deter – future conflicts. Jacquelyn Schneider, a Hoover fellow and director of Hoover’s Wargaming and Crisis Simulation Initiative, explains the fine art of quality war-gaming – and how the practice applies to current tensions between the US and China, and perhaps played a role in the current Russia-Ukraine conflict.