I was in Germany last week recording my latest DVD on this topic. During my research I discovered just what a wonderfully bizarre opening it is and look forward to giving it a whirl in some of my own games. It’ll certainly make a pleasant change from my usual 1.g3.
Here’s Larsen himself using it in one of the games featured on the video. The exchange on f6 to damage Black’s structure (5.Bxf6) occurs surprisingly often though not usually in conjunction with a later advance of White’s g-pawn. Wonderful stuff!