{"slug":"thinker-robert-axelrod","verification":{"valid":true,"entries":3,"head":"41c08634fff026e9f2ad6ad784176240237c0585c05113678861bbdd8088ac07"},"count":3,"sources":[{"id":"s1","type":"other","url":"https://en.wikipedia.org/wiki/The_Evolution_of_Cooperation","title":"The Evolution of Cooperation","quote":"In both actual tournaments and various replays, the best-performing strategies were nice: that is, they were never the first to defect.","summary":"Wikipedia summary of Axelrod's 1984 book and tournament results with key strategy descriptions.","claim_ids":["c1","c2","c3","c4","c6","c8","c9"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-07T07:13:01.587Z","link_status":"ok","quote_status":"unverified","prev":"genesis","hash":"058930223577cd16906323abf5ad7ce49be93f79a8fd446c82e334d8f439ba6c"},{"id":"s2","type":"other","url":"https://www.jasss.org/1/1/review1.html","title":"Robert Axelrod - The Complexity of Cooperation","quote":"What accounts for TIT-FOR-TAT's robust success is its combination of being nice, retaliatory, forgiving and clear.","summary":"Review confirming the 1997 book and extending the tit-for-tat properties.","claim_ids":["c5"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-07T07:13:01.587Z","link_status":"ok","quote_status":"verified","prev":"058930223577cd16906323abf5ad7ce49be93f79a8fd446c82e334d8f439ba6c","hash":"ee97e02c44095ec77ab82f7815ffe26df9d7940f78549ba5869d6ff889d6d164"},{"id":"s3","type":"other","url":"https://websites.umich.edu/~axe/Axelrod_Evol_of_Coop_excerpts.pdf","title":"The evolution of cooperation excerpts","quote":"For cooperation to prove stable, the future must have a sufficiently large shadow.","summary":"Direct excerpts from Axelrod's 1984 work hosted at University of Michigan.","claim_ids":["c7","c10"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-07T07:13:01.587Z","link_status":"timeout","quote_status":"unverified","prev":"ee97e02c44095ec77ab82f7815ffe26df9d7940f78549ba5869d6ff889d6d164","hash":"41c08634fff026e9f2ad6ad784176240237c0585c05113678861bbdd8088ac07"}]}