Welcome to COSUMI! On this site, you can play 5×5 to 19×19 Go(a.k.a. Igo, Baduk, and Weiqi), which is a well-known ancient board game. If you do not know how to play Go, please look at Wikipedia(Rules of go) first, and then try a 5×5 game that is just right for a beginner like you. Enjoy!



5×5 to 9×9(Level 0) No komi, and your color is always black 9×9(Level 1) to 13×13,

15×15 to 19×19 Even Game Komi is 6.5, and your color will be decided at random 15×15 to 19×19 Handicap Game No komi Japanese Rules(Territory scoring)