Laddrchess (The Duolingo for chess)

Interesting. I'm checking it out now. I can seemingly report a bug too, in the first chapter in the section on castling, castling doesn't seem to be possible (The king can only move one square)
Interesting. I'm checking it out now. I can seemingly report a bug too, in the first chapter in the section on castling, castling doesn't seem to be possible (The king can only move one square)