In 2011, Zen19D reached 5 dan on the KGS Go Server, playing games of 15 seconds per move.
The account which reached that rank uses a cluster version of Zen running on a 26-core machine.
After the AlphaGo AI defeated professional players Fan Hui 2p and Lee Sedol 9p in 2015 and 2016, Yoji was inspired to upgrade Zen with deep learning algorithms.
[5] Around the same time, DeepZenGo participated in the 2017 Computer Go UEC Cup, coming second behind Fine Art.
Both programs then won their exhibition matches against Ichiriki Ryo, 7-dan Japanese professional.