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On this thread, the user asked what is the longest unintentional fork that Bitcoin had suffered. From the answers present, Bitcoin never had a >4 block fork until 2012.
It has been 6 years though, and I wonder if there is a more up-to-date statistics on that question, and if any study has been done so far.
Wow, was that a brute PoW fork? Or was that a bug / protocol patch or similar? – MaiaVictor – 2018-09-19T14:49:57.887
1It was an issue with version of bitcoin client.Miner mined with the version 0.8.0 which wasn't compatible with version 0.7 – VforVendetta – 2018-09-19T14:53:18.173