Go is ancient strategy game with simple rules. Hactar go is perfect for learning go, and to study go anywhere you are. Hactar offers pro-level AI analysis. It can be used to find better moves or mistakes from any games. Even more accurate AI analysis as subscription. It is possible to search games for position or players. Search covers games from well-known public WEB archives, more that 90000 professional games are available. You can also include your games in the device to the search. Hactar contains over 410 go problems (tsumego). You can also add your own collections easily, or download additional 400 problem with few clicks. Hactar GO can be used to view and record go games in SGF format. Hactar supports variations and setup stones. Hactar can automatically replay games. Hactar can play with you, it has 1 dan strength in 19x19, 13x13 and 9x9 boards. If this is not enough, you can subscribe to stronger engine playing at pro level. Community provided translations are welcome! The instructions for translations are at https://gowrite.net/forum/viewtopic.php?t=898 Please report bugs using email or feedback! It is difficult to offer support in Google Play forum. Go is known also as igo, in China as 围棋 (Weiqi) and in Korea 바둑 (Baduk). The application price includes at least 2 years of use of the network services. Full features available in Android 7.1 and later. Older and more limited application may be available for older android versions. Hactar does not contain ads and it does not collect personal information. For the full license, please see http://gowrite.net/hactar/eula.shtml.