Grand Prix Attack - easily winning

The Grand Prix Attack can be a very tricky opening to deal with for the uninitiated.  Here is the end position when I was White and it was my move ...  My opponent resigned on the spot ... 

Actually - I was convincingly losing this game as early as move 10 according to the engine !!!  

The e5 pawn turned out to be a challenging unit for Black to deal with - and all my piece swooped down on the Kingside ...

Here is the full game .. 

   

Probability of this game having ever have been played before?

Fun Fact:  In summary, the likelihood of a chess position after 23 moves for both White and Black having occurred before is for all practical purposes zero. The number of possible games and positions is so vast that every game played is essentially a unique creation.

I find this quite astonishing!