If you’ve never heard of Huang Longshi, then… it’s not surprising at all. He lived in 17th century China and it was the Japanese players who ruled in the world of Go at the time. However his contemporaries described him as a heavenly spirit turned human, and Go Seigen, the greatest player of the 20th century, believed that Huang Longshi would be at least 13 dan if he were alive today! Is that merely an overstatement? Maybe the games of this ancient master reviewed under the magnifying lens of modern computer programs will help shed some light on this mystery.