[Event "Game with long & short comments and variations 3."]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]

1. e4

{I'm a long comment with an empty sub-variation sibling.}

1... e5 2. Nf3

({I'm a long variation followed by an empty variation.} 2. Nc3)

2... Nc6 *