COSUMI KR
Date：2026-09-26
Introduction to the brand/website:
COSUMI (cosumi.net/ko) is a free online Go browser game that allows players to compete against the computer on boards ranging from 5×5 to 19×19.
Designed for both beginners and experienced players, the platform offers different difficulty levels, even games and handicap games based on Japanese rules. Beginners can start with smaller boards and access basic Go rules and learning resources, while more advanced players can challenge COSUMI on larger boards.
Powered primarily by the KataGo and GNU Go Go engines, COSUMI provides an accessible way to practise Go online without installing dedicated software.
The website is available in Chinese, English, Japanese and Korean.