I don't think Sigurdsson was involved that much. He played a good pass your second goal as you said, and hit some good set pieces. Apart from that I didn't notice him that much though in open play. Then again, it is probably not that easy to make a big mark in a game where neither team tries, or is able, to play proper football.
Congrats with your win though. It was a tight game that could have gone either way. Certainly a big blow to our hopes of qualifying for the World Cup. Unfortunately for us you managed to bundle that first goal over the line after we had made the best start. It very much turned the game in your favour. We didn't manage to create enough chances though, although we created as many as Iceland. I am also not sure whether it was actually offside when we scored. An Icelandic player was lying down with his foot very near goal on that occasion. I have only seen a quick replay though. Regardless of whether it was a correct decision or not, the referee was a complete joke throughout the game, and dare I say, a bit of a homer