Zhou Zhenyu (pictured) is a former Chinese 4 dan professional who was promoted to amateur 8 dan after finishing 3rd in a recent major amateur tournament in China. In 2000, 14-year-old Zhou Zhengyu won another major amateur tournament and won the same tournament again in 2021. He once said: "Becoming a professional Go player was my big mistake." After giving up his professional dan in 2017, Zhou Zhenyu has made more money than he was able to in pro status, "I've become more famous, happier than before. I'm also happy to participate in tournaments with my daughter." Zhou's games on Go4Go: https://go4go.net/go/games/byplayer/133 Judging by his winning percentage (44.1%) - in the past he was a mid-level professional who could beat top masters in some games. But Zhou himself never fought for big titles.
