strategy

Game theory explained: Nash equilibrium, Prisoner's Dilemma, evolutionary games, auctions, and real-world applications from biology to AI.

Two criminals. One interrogation room. A math problem that reveals why rational people often produce irrational outcomes.

Russia has produced more World Chess Champions than any country — 16 of 17 champions from 1927 to 2007 were Soviet or Russian. India is now the world's fastest-growing chess nation with 80+ active grandmasters. Magnus Carlsen of Norway held the world title for 10 years. Here are the countries dominating chess.

Why does Russia keep fighting over access to the sea? Why does the United States have so much room to maneuver? Why has Poland been invaded from both sides? Geopolitics argues that mountains, rivers, coastlines, and resources shape political choices more than most people expect. Here is how the idea works, and where it breaks down.