What the heck is the Jaenisch Gambit?

I'm playing on Chess.com -- these aren't sponsored videos but the site seems pretty cool.
Chess has been having a resurgence in popularity this year so I have finally acquiesced to semi-popular demand and started to play a bit. First, let's hone our skills and get a little more warmed up and then let's conquer chess dot com one board gamer at a time.
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About this game:
the horse moves like an L