Black is developing his king side bishop and preventing white's Ng5 which would be the Fried Liver Attack. This is considered weaker than black playing Bc5 on his third move which would make it a Guico Piano. Italian for quiet game. Weaker because it blocks his queen but not an inferior move.
Black often mistakenly resigns here, but can in fact battle on with 6 ... Nh6 7. Bxh6 0-0 ! 8. Nxc3 gxh6. Black is in a mess but need not resign yet. If Black is lucky, White might play 8. Bc1 Nb4! 9. Qd1 and ... c2 wins the piece back.
34 ( +1 | -1 ) Be5?What do you mean by that? Got to be a typo!
The most defensive opening I know? Aside from from Cheyenne Mountain, Colorado aka NORAD, the real tunnel where the movie War Games was based upon, I'd say the Pirc opening. Its at times like playing rub-a-dub on the ropes in boxing, just waiting for your chance to counter.
65 ( +1 | -1 ) The basics of the Pirc are (but possibly not the actual definition): 1. e4 d6 2. d4 Nf6 3. Nc3 g6. Then, 3. Nf3 is the classical whereas 3. f4 is the something attack (Austrian?).
I wouldn't say the Pirc is defensive, or at least the most so. It's a hypermodern opening, conceding space but hoping for activity to strike back at the center and claim it later.
In my opinion, the Philidor (1. e4 e5 2. Nf3 d6 -- note that you can start off with the Pirc move order to arrive at the Philidor...) is the most defensive. It doesn't really seem to prepare a counterattack in the center. It bottles up all of black's pieces instead of trying to grant them more mobility as in the Pirc. There are some lines to play it aggressively, but they seem almost suicidal (and fun!).
65 ( +1 | -1 ) Its funny how moves like 1. d6 and 1.e5 followed by d6 are considered ok for black, but the equivalent moves for white are deemed unacceptable... I don't think the pirc is a very good opening, the Austrian attack seems very strong against it and so does f3 (after the first 3 moves mentioned by ganstaman) to support g4 later. I read somewhere that the pirc is not very successful at grandmaster level, i think that's probably enough to seal it's fate.
And yes, Philidor is probably most defensive opening there is. I've always thought it to be a bit of a demented opening, what's the point of releasing the black bishop and then blocking it in again? That's just silly.