{
  "title": "Prisoner's dilemma five-rule round robin",
  "description": "A round robin of five rules for the repeated prisoner's dilemma (always betray, always silent, tit for tat, grim trigger, random), each meeting all five including a copy of itself, with another round following at probability 0, 1/2 or 9/10. Points per round are given exactly and as simulated (200,000 matches per pair and setting, fixed seed 490004); the two agree within 0.02. Round-robin, pairwise and round-by-round rows (tit for tat against always betray) are marked in the table column. Results hold only for this pool of rules and these settings. Computed 2026-10-31. License CC BY 4.0.",
  "license": "CC BY 4.0",
  "license_url": "https://creativecommons.org/licenses/by/4.0/",
  "creator": "Puzzles, Charts & Dilemmas",
  "page": "https://puzzleschartsanddilemmas.com/dilemmas/prisoners-dilemma/",
  "derived_from": [
    "Computed by Puzzles, Charts & Dilemmas with the payoff table in prisoners-dilemma-payoffs.csv on this page",
    "Rule definitions (tit for tat, grim trigger) as described in Steven Kuhn, Prisoner's Dilemma, Stanford Encyclopedia of Philosophy (substantive revision 2025-10-24), https://plato.stanford.edu/entries/prisoner-dilemma/ (facts paraphrased, no text reproduced)"
  ],
  "method": "Compiled by Puzzles, Charts & Dilemmas from the data listed"
}