Chess: Pirc Defense (Austrian Attack)



Position after 5 ... c5

Why 6 d5 is bad?

It invites ... e7-e6, and following White's
d5xe6 Black solves his opening problem
by ... Bxe6 and then ... d6-d5.
If White
allows ... e6xd5, his pawn structure
becomes unsound, thanks to the
obstructing f4 pawn.