When I encounter an interesting question on Chess StackExchange, I would like to import that game to http://lichess.org, to be able to analyze it with Stockfish. When I use the "Copy game" option (for example from this question) and paste that PGN into https://lichess.org/paste, it does not work (I get an empty board).

It seems that the problem is the [FEN ""] tag: if I remove it, it works. If I replace that tag with [FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"], it also works.

Is this a bug in lichess or in stackexchange? In other words, is the empty string a valid FEN position?



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