There was a lot of great work done replicating and then improving on AlphaGo in an open manner. The center(s) of that were LeelaZero and then KataGo. It's a bi

There was a lot of great work done replicating and then improving on AlphaGo in an open manner. The center(s) of that were LeelaZero and then KataGo. It's a bit hard to say for sure (since you can't pit them against each other, AlphaGo isn't available), but KataGo is very likely to be well stronger than AlphaGo ever was, unless maybe they contuinued it internally (unlikely). If nothing else it's vastly more efficient to train and experiment with.