Details on the strategy employed by the human are at https://goattack.far.ai:

> We discovered simple adversarial strategies that beat superhuman Go AIs, and find that adding defenses helps but does not eliminate the problem. Our cyclic adversary beats the state-of-the-art KataGo AI more than 97% of the time at superhuman settings. This strategy is simple enough to be replicated by an amateur human player and transfers to other superhuman Go AIs.

At the time (316 points, 134 comments) https://news.ycombinator.com/item?id=34841339