Your move order posted is not correct...1.e4 , g6 2. Bg7 , d4...
You need the book by Lev Albert,"The Pirc Alert!" This will show you the similarities between the "Modern and the Dragon and the Phillidor and several other modern type defences!!"
The biggest thing is when to apply them...The KID is the same set up as the modern and the Pirc...The modren changes to the pirc and vice versa!!!
TACTICS! TACTICS! TACTICS! Learn to transpose!! Above all know and practice tactics!!!!
1. e4 g6 2. d4 Bg7 3. Be3 c5 4. c3 cxd4 5. Bxd4?! (I'm black)
How would black best deal with this unorthodox approach to the modern? The one game in my database with this opening has a master class player play 5...f6 which looks extremely awkward to me, and I refuse to believe such a opening by white can cause this much of a concession.
The way I've been dealing with it has been: 5... Nf6 6. e5 Nd5 7. Bxa7 Nxc3 8. Nxc3 Rxa7 but I'm still not convinced whether this is good for black or if I missed something beforehand.
help?