Played a game a couple of weekends ago and came against an odd loking Pirc out of book knowledge I decided to try something new inspired by my study of the samisch kings indian and Prins sicilian.

Checked on my database and got no hits and was wondering if anybody had a larger one to check. thanks for any help here is the opening.

After 4...ed4 it has transposed into a Philidor (e4 e5 Nf3 d6 d4 ed4 Nd4 Nf6 Nc3 sort of the line) 3...e5 is an interesting way of getting a philidor whilst avoiding a few lines I think. You can play 4 de5 and getting a slight edge without the queens on. Your idea of f3 is interesting, however if black gets in a quick d5 he should be ok, I suppose he has lost time with d6 first but it should be ok. The philidor tends to be quite passive anyway and the english attack (the set up at the end and playing g4, h4, h5 etc etc on the kingside. Very dangerous.)

The kingside attack idea is how I ended up winning the game. Yeah I noticed the transposition into the philidors.

What is black's strategy behind 3...e5?  It appears that this move would result in a queen trade on the 5th move that puts black at a disadvantage. 

After dxe5 and black recaptures with dxe5, doesnt black lose the ability to castle then?

Yes, he loses the ability to castle, but that's not such a big deal with the queens off.