PlayOK (formerly Kurnik) is a Polish server for many games, like Ludoteka or Yahoo! Games. Support for English language is provided. There are usually about 100 players online of mixed but typically lower ranks: http://www.playok.com/en/go/
The server previously offered ladders and regular tournaments, but these features were removed.
Some differences from most servers to be aware of:
- The scoring process can be difficult, captured regions are not highlighted so players need to double check that all dead stones are marked correctly.
- There's no mapping from ELO ratings back to Kyu/Dan ranks so it can be difficult to understand the relative strengths of other players.
- AGARules is used.
- Only Canadian timing is offered, with a fixed 25 moves per period. The period time is misleadingly labeled as byo-yomi.