1 1. Introduction: five first lessons 2 2. Putting yourselves into other people's shoes 3 3. Iterative deletion and the median-voter theorem 4 4. Best responses in soccer and business partnerships 5 5. Nash equilibrium: bad fashion and bank runs 6 6. Nash equilibrium: dating and Cournot 7 7. Nash equilibrium: shopping, standing and voting on a line 8 8. Nash equilibrium: location, segregation and randomization 9 9. Mixed strategies in theory and tennis 10 10. Mixed strategies in baseball, dating and paying your taxes 11 11. Evolutionary stability: cooperation, mutation, and equilibrium 12 12. Evolutionary stability: social convention, aggression, and cycles 13 13. Sequential games: moral hazard, incentives, and hungry lions 14 14. Backward induction: commitment, spies, and first-mover advantages 15 15. Backward induction: chess, strategies, and credible threats 16 16. Backward induction: reputation and duels 17 17. Backward induction: ultimatums and bargaining 18 18. Imperfect information: information sets and sub-game perfection 19 19. Subgame perfect equilibrium: matchmaking and strategic investments 20 20. Subgame perfect equilibrium: wars of attrition 21 21. Repeated games: cooperation vs. the end game 22 22. Repeated games: cheating, punishment, and outsourcing 23 23. Asymmetric information: silence, signaling and suffering education 24 24. Asymmetric information: auctions and the winner's curse