Lecture 15 - Backward induction: chess, strategies, and credible threats
recorded by: Yale University
published: Nov. 15, 2010, recorded: September 2007, views: 3223
released under terms of: Creative Commons Attribution No Derivatives (CC-BY-ND)
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We first discuss Zermelo's theorem: that games like tic-tac-toe or chess have a solution. That is, either there is a way for player 1 to force a win, or there is a way for player 1 to force a tie, or there is a way for player 2 to force a win. The proof is by induction. Then we formally define and informally discuss both perfect information and strategies in such games. This allows us to find Nash equilibria in sequential games. But we find that some Nash equilibria are inconsistent with backward induction. In particular, we discuss an example that involves a threat that is believed in an equilibrium but does not seem credible.
Strategies and Games: Theory And Practice. (Dutta): Chapters 11-12
Strategy: An Introduction to Game Theory. (Watson): Chapter 21
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