[FEN ""] 1. d4 d6 2. e4 g6 3. Nc3 Nf6 4. Nf3 c5 5. dxc5 Qa5 6. cxd6
Above you can see the first moves of a Pirc Defense game. To study this opening, I learn with the book "Pirc Alert!" by Lev Alburt and Alex Chernin.
After 4. Nf3, there is a trick which consists of ...c5, ...Qa5 (two pawns are threatened) and ...Qxc5, winning the pawn, ...c5 and bringing a Sicilian Dragon pawn structure, which is very good. But today I played an Internet game (seen above) and White's move 6. cxd6 seems very good. The authors of my book didn't speak about this move.
I had over viewed the position after 6. dxc6 and neither I nor my chess engine. could find any strong reply.
Is the move 6... exd6 strong? What is Black's best reply to 6. cxd6?