Gunderam defense

1.e4 e5

2.Nf3 Qe7

3.Nc3 Nf6

4.Bc4 Nxe4

5.Nxe4  c6

6.Be2   f5 or d5

I like this opening because I get to move my pawns in the center but i don't know how long they'll get to stay there.

The idea is no doubt immaginative but i don't know if it's going to work in the end.

B is severely behind in development and material, his centre looks imposing but i tryed to calculate some variations and W always seems to crack the centre while retaining the extra piece. Heve you played some games in this line? If yes than can you post it?

Another thing to say is that the variation is hardly forced. W can sidestep this with 1.e4 e5 2.Nf3 Qe7 3.Bc4 Nf6 4.d3 followed by Nc3 and W has more or less the same setup. The wasted queen move is hardly a big problem at amateur lever (i know of a drawn GMvsGM game with 2...Qe7?!) but still not very exciting.

(returning to your move order, in a blitz game the pawn sac 5.0-0!? would have caught my eye. W has a very big lead in development, but maybe B center is solid enough to limit W activity)

Things are not always so easy. This idea is similar to the halloween gambit, which is not so tremendously bad at the end of the day (i mean, it doesn't work in the end but it's quite hard to prove at our level and W no doubt has some positional compensation beyond the early tricks). A big difference is that here B is severely behind in development, and this make things easier for W. But i wouldn't be surprised to lose to this variation in a blitz game. 

BTW, my 0-0 gambit is probably more ?! than !?. A better way to avoid complications might be Nd5.

12 years later....