FEN chess visualizer

Display a record of a chess position in Forsyth–Edwards Notation as a chess board. The FEN record has to be complete (with active player, castling &c.) and it has to be enclosed in [fen]/[/fen] tags. This is the way that can be used on AnkiDroid and, apparently by some old Anki1 add-on as well. Example: Just put [fen]rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1[/fen] on a card. This add-on does the display without any images. When you don’t see the chess pieces you should install a font with them. Maybe one from here or here. There is a short manual page at my github site. This [fen]-notation does not work on Anki web. There is a shared deck that can be used instead.