In Go, a rank is assigned to every regular player, which indicates their skill level.

The ranks of particularly good players range from 1 dan up to 9 dan.

But can you tell someone's strength just from looking at their games?

This site allows you to try and see.

You will be presented a kifu (game record) of a game without information about the players. You then try to guess their ranks, before you get to see their real ranks. You'll be in for some surprises!