{
    "event": "Game with promoted variation.",
    "mainVariation": [
        "e4",
        {
            "notation": "d5",
            "variations": [
                [ "c5" ],
                [
                    "e5",
                    { "notation": "Nf3", "comment": "Used to be the main line" }
                ],
                [ "c6" ],
                [ "g6" ],
                [
                    "d6",
                    { "notation": "d4", "comment": "Used to be a nested variation" }
                ]
            ]
        },
        "exd5",
        { "notation": "Qxd5", "comment": "Used to be the variation at index 1" }
    ]
}