悠然围棋 is a fully featured Go application available on the App Store. It offers a wide range of functionalities, making it the ideal choice for both learning and entertainment purposes for Go enthusiasts.

The app includes a built-in AI engine for playing against the computer. It is fast and highly skilled, providing an excellent way to practice and have fun in your leisure time.

In addition to the AI mode, 悠然围棋 also allows you to play against other Go enthusiasts from around the world. This online multiplayer feature enables you to improve your skills by challenging players of different levels. The app even supports voice communication during matches, allowing for a more engaging experience. You can also watch other players' matches and participate in friend rooms for friendly competitions. Offline messaging and the ability to pause games further enhance the overall experience.

悠然围棋 goes beyond just playing games and offers various learning features. It includes an extensive collection of joseki (opening patterns) tutorials, covering hundreds of thousands of variations and providing insights into common mistakes and tricks. The app's unique joseki engine displays each step clearly, allowing you to fully understand the intricacies of different variations.

Furthermore, 悠然围棋 comes with 500 selected professional game records, accompanied by textual explanations. This feature facilitates your study and analysis of high-level games. The app also supports importing SGF format game records from your computer and downloading SGF game records directly from the internet. This allows you to access millions of game records available online, making 悠然围棋 the only app with this functionality. Notably, it even includes game records of AlphaGo's matches against top Go players such as Ke Jie and Lee Sedol.

For any feedback or suggestions, you can contact the developer at Experience the joy of Go with 悠然围棋!