The entries in this combined essay share one idea: a small number of strategic situations recur everywhere, from marriages to arms races, and recognising which one you are in tells you most of what will happen. The models name the shapes; the precepts and sayings are what practitioners took from them.
A handful of games
The Prisoner's Dilemma is the most famous: each side does better by defecting, and both end up worse off. The Stag Hunt is its gentler cousin, where cooperation pays if each can trust the other to try. Chicken rewards whoever looks less likely to swerve; the Battle of the Sexes is about agreeing on something when each prefers a different something. The Volunteer's Dilemma, the Diner's Dilemma, the War of Attrition and the El Farol Bar Problem add the everyday versions: waiting for someone else to act, ordering expensively when the bill is split, outlasting a rival, and avoiding a crowd everyone else is also avoiding.
The power of limiting yourself
Thomas Schelling's contributions form the group's intellectual centre, and his most surprising idea is that binding yourself can make you stronger. Credible Commitment, Brinkmanship and the Strategic Commitment Effect all turn on it: a threat or a promise works only if the other side believes you cannot back out. Crossing the Rubicon is the old image for the same idea. His Focal Point explains how people coordinate without talking, by converging on whatever seems obvious to both.
How cooperation survives
Repetition changes everything. Axelrod's tournaments made Tit-for-Tat famous: cooperate first, then mirror the other side. Grim Trigger sustains cooperation through the threat of permanent retaliation, and Strong Reciprocity proposes that many people are disposed to cooperate and punish defectors even at a cost. The Multipolar Trap describes the failure case, where competitors are each forced to abandon a shared value to avoid being outcompeted.
Bargaining and design
The negotiation precepts are the group's most practical. BATNA says your power in a deal comes from the quality of your alternative, and ZOPA marks the range where agreement is possible. The Holdup Problem warns that once you have invested in a relationship, the other side can renegotiate. Mechanism Design inverts the whole field: instead of predicting how players will behave under given rules, it designs rules that make self-interested behaviour produce the outcome you want.
A different strategic tradition
The Chinese and Indian entries approach strategy from another direction. Shi, from Sunzi, locates advantage in the configuration of a situation rather than in force. Sanshiliu Ji, the thirty-six stratagems, and Kong Cheng Ji, the empty-fort ruse, catalogue deception. Kautilya's Rajamandala treats the neighbouring state as the natural enemy and the one beyond as the natural ally. Where Western game theory seeks equilibria, this tradition seeks positions and misdirection.
Where it applies
The games are a working vocabulary for international relations, business strategy and negotiation. Chicken and brinkmanship describe standoffs between states and between firms; the holdup problem explains why companies buy their suppliers. Mechanism design runs matching markets such as school admissions and kidney exchange. The multipolar trap is now a standard frame for arms races of every kind, including in technology.
Where it is argued over
The central dispute is whether real people play as the models assume. The Centipede Game is the sharpest case: backward induction says to defect at once, and real players cooperate for many rounds. Tit-for-tat's success depended on the other strategies in Axelrod's tournament. Strong reciprocity is disputed as a distinct disposition, the empty-fort story comes from a novel, and the Win-Win Principle depends on the situation actually being positive-sum, which its critics say is often assumed rather than checked.
Why it is worth knowing
Most strategic mistakes come from misreading the situation rather than from bad tactics within it: treating a stag hunt as a prisoner's dilemma, or a coordination problem as a contest. These entries supply the shapes. Knowing a dozen of them makes it possible to ask, in any conflict, which game this is, and whether it could be turned into a better one.
The entries behind this essay: Model and Precept and Figure in Games & Strategic Interaction. Every subject has its essays on the essays page.