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Fascinating: @drvinceknight tried to reproduce the famous results of Axelrod's first Prisoner's Dilemma tournament, in which Tit-for-Tat reportedly won. He used reimplementations of the same strategies used in that tournament
Tit-for-Tat ranks 8 /15 in the reimplementation(!)https://twitter.com/drvinceknight/status/1133408058179235846 …
Good discussion of what this may mean at the link. I really enjoyed Axelrod's book (https://www.amazon.com/Evolution-Cooperation-Revised-Robert-Axelrod-ebook/dp/B00AHFJ5VS/ref=sr_1_1?keywords=axelrod&qid=1559086154&s=gateway&sr=8-1 … ), and it has influenced my thinking quite a bit. It's well known that the best strategy is context-dependent; all the same, I must admit I'm a little bothered by this.
Has nobody bothered to redo this experiment before? That's hard to believe.
Same here re: Axelrod's book and slight unease. But least the top strategies are pretty Tit for Tat -like...?
Yes— I think all the conclusions people tend to cite Axelrod for are intact after this, EXCEPT for the claim that successful strategies must be extremely simple.
Tit-for-tat is just a particularly simple member of the family of “cooperative strategies”. The more important result—the general success of cooperative strategies—did replicate. Moreover, it looks like a bunch of such strategies did approximately as well as each other.pic.twitter.com/mKZU5vAHDj
What @mhartl said 
(I did attempt to emphasise that in the later part of the post)
Well, 'reproduced from descriptions' feels significantly imprecise -- but it doesn't change the fact that Tit for Tat appears a bit brittle...
FYI, we have reproduced his second tournament using the original fortran code and whilst the exact results don't follow (it looks like there are some coding errors in the original code) the results are [essentially] the same: TfT wins that one.
You might find more up to date tournaments and research here interesting: - Full tournament with all strategies in library https://axelrod-tournament.readthedocs.io/en/latest/ - Latest publication from the group:https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0204981 …
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