sharpest reply against d4

i like playing the sicilian najdorf opening a lot. the games are very complicated and wild and fun to play.

what is very sharp opening that black can play against d4?

is it the benoni ?

The budapest is sharp and aggressive.

1.d4 Nf6 2.c4 e5, with black playing Ng4 after 3. dxe5.

I think you mean

1.d4 Nf6 2.c4 e5, with black playing Ng4 after 3. dxe5.

Oh dear! Thank you, guymat!! :) Yes, that's what I meant.

KID can be quite wild, as can the Benoni or the Grunfeld. Or there is the Budapest, as others have already said.

...g5!!(!)

That looks really interesting? What is it called?

Also what happens if they kick the knight?

Thanks

There's always the Albin Counter Gambit.

I was assuming 2.c4 will be played. I didn't see 2.Nf3 mentioned anywhere by the OP. Where is it?

The Dutch Defense can be considered one of the sharpest replies to 1.d4. 

Alexander Alekhine, Bent Larsen, Paul Morphy, Miguel Najdorf, and Hikaru Nakamura, among others, have all used it with success.

David Bronstein and Mikhail Botvinnik both used it as Black several times in their 24-game 1951 World Championship Match.

I prefer the KID

Any opinions on the Slav or Semi-Slav?

Probably the Triangle/Noteboom.

Harbring3r,

In saying, "There's always the Albin Counter Gambit," cornbeefhashvili probably means that the original poster can always include that opening in his repertoire if other choices are undesirable, not that the op can play it in every game. (It can be played against d4, even if the white player has to cooperate for a move.)

Having said that, here's a recommendation for 2.Nf3 if you like playing the Albin.

http://tws27.50webs.com/chess/albin1.html

The Semi-Slav is very sharp.

I'd say the KID

The Budapest can't be reached if white plays 2. Nf3

White always has the option of the Exchange Slav

While Black should have equality in the Dutch against 2. Bg5, this type of position may not be what the OP is looking for

With the Benoni, if white does not play d5, the opening will I think end up in a Symmetrical English. Again, no problems for black probably but not what the OP may be looking for.

Perhaps the Chigorin seeing that Alexander Morozevich plays it is another option.

Not if Black plays the "Triangle" move order with 2...e6 and 3...c6

If you like playing sharp Sicilians, you might enjoy the Grunfeld.

The Grunfeld proceeds 1. d4 Nf6 2. c4 g6 3. Nc3 d5. The most common line here is 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 where white has a strong center but black has a lot of dynamic play against it in the form of c5, Nc6 and Bg4 ideas to try to take down white's pawns.

Other lines include:

4. Nf3 Bg7 5. Bg5, where after 5...Ne4 6. cxd5 Nxg5 7. Nxg5 e6 8. Nf3 exd5, white plays to try to force black to play ...c6 and then play b4-b5 like an Exchange Q.G.D., while black often plays on the kingside.

4. Nf3 Bg7 5. Qb3 dxc4 6. Qxc4 where white plays very aggressively and also creates a large center with e4 coming up soon, but often loses time at the expense of his queen.

The lines have a lot of theory to them, which is the biggest downside of the opening. However, they are very sharp and fun to play, and I guess most Najdorf Sicilian lines also have a ton of theory as well. I think that the Grunfeld is probably one of the sharpest good lines against 1. d4. Other options include the Modern Benoni and the Benko Gambit. Openings like the K.I.D. and the Dutch might also be considered for aggressive players, but they aren't always considered as sharp as the Grunfeld because the center is often more locked up and there aren't as many pieces flying all over the place as there are in the Grunfeld. In those openings, black does still play a very risky game as well, trying to play for checkmate on the kingside in many lines, so they may also be to your liking.

White d4 players hate the Benko Gambit. Another, more offbeat, option is the Pterodactyl (Sniper) Defence (1... g6 2... Bg7 3... c5 against almost any popular White setup; search for 'pterodactyl' in the openings section because it branches into many 'ancient birds'), which actually often transposes into a Sicilian (e.g. the Hyperaccelerated Dragon 1. e4 c5 2. Nf3 g6 3. d4 Bg7 is also obtained via 1. d4 g6 2. Nf3 Bg7 3. e4 c5; one of the ideas is that in case of dxc5 the pawn is regained by simply Qa5+, whereas the bishop puts pressure on c3 as it isn't blunted by the king's knight yet).