Play the Polar Bear!

GM Henrik Danielsen explains the "Polar Bear" system, which is Bird's Opening (Dutch Attack) played as a Leningrad Reversed with a number of transpositions depending on what Black plays:

There are a lot more videos on the Polar Bear by Danielsen; check them out using the YouTube link below. GM Joel on the Polar Bear. Bird's Opening is ECO A02 and A03. Some Polar Bear-style games at Chessgames.com.

Source: YouTube. Thanks, Will, for showing me the Polar Bear.