user101: One of my favorite openings is the King's Gambit.  It is extremely aggressive, and makes for a sharp tactical game without sacrificing too much material.  It isn't played much at the highest level at standard time controls, but even today it is occasionally used in blitz by top level players such as Hikaru Nakamura.
What other openings for black or white would force these kind of very aggressive, tactical, sharp and open games?  (Without putting yourself in too bad a position.)

user23691: The Fried Liver is good, and according to Stockfish, black would NOT have a "slight advantage" even if they defend properly.

user24713: Luccini Gambit
[FEN ""]
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5 5. Ng5 f4 6. Nf7 Qh4

Nakhmanson Gambit
[FEN ""]
1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nc6 5. O-O Nxe4 6. Nc3 dxc3 7. Bxf7+ Kxf7 8. Qd5+


user7266: I think the second diagram in this answer is a position called Mat de Legal.
This variation of the Scottish gambit is quite aggressive too:
[FEN ""]
[Title "Scottish gambit / Mat de Legal"]

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+ 5.c3 dxc3 6.O-O *


user11245: I like the Colorado Counter Gambit for Black in Blitz. Here's an example:
Colorado Counter-Gambit: 
[Event "FRG-ch corr"]
[Date "1987"]
[White "Hallier, Karl Heinz"]
[Black "Winckelmann, Thomas"]
[Result "0-1"]
[PlyCount "38"]
[Result "0-1"]
[FEN ""]

1. e4 Nc6 2. Nf3 f5 3. exf5 d5 4. Nh4 e5 5. Qh5+ g6 6. fxg6 Nf6 7. g7+ Nxh5 8.gxh8=Q Qxh4 9. d4 Bf5 10. Bd3 e4 11. Be2 O-O-O 12. g3 Bb4+ 13. c3 Qe7 14. Qxd8+ Kxd8 15. Bxh5 Nxd4 16. Bd1 Nf3+ 17. Ke2 Qc5 18. Ba4 Qc4+ 19. Kd1 Bg4 0-1

You might notice who was playing Black: the famous Thomas Winckelmann (of Winckelmann-Riemer Gambit fame).  And it was a correspondence game. And he beat White, who had essentially all the time in the world, in 19 moves.

user11431: For me, it has to be Scandinavian Alekhine. Although it could be responded by Alekhine's defence (B02), Spielmann variation and would prove better.
Both sides' queen, both sides' centre pawn, both sides' knight with good position lost as soon as the 7th move.
Alekhine Defense: Scandinavian Variation: 
[Event "Computer Chess Test B02"]
[Date "2016"]
[White "Stockfish 9"]
[Black "Komodo 10"]
[Result "0-1"]
[Result "1-0"]
[FEN ""]

1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. fxg7 cxd2 6. Qxd2 Qxd2 7. Bxd2 Bxg7 8. O-O-O


user13120: I recommend to try Grob's Attack. This opening is very agressive for both white and black. And a lot of players don't know to play correctly in this opening as I found.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. g4

Black can answer with Romford Countergambit, for example:
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. g4 d5 2. Bg2 Bxg4 3. c4 d4 4. Bxb7 Nd7 5. Bxa8 Qxa8 6. f3 d3


user17136: I personally like the Grob opening, especially for blitz.
It goes:

g4

And, just an example of a continuation:
.. d5 2. Bg2 Bxg4 3. c4 e6 4. Qb3
I also like using the same idea as black playing against 1. e4. For example:

e4 g5 2. d4 Bg7 3. Bxg5 3. c5 4. Be3 Qb6

The computer evaluation isn't always sound, but in practical play (in blitz), it works pretty well.

user-1: The Caveman variation (Caro-kann advance variation sideline) should do the trick:
[FEN ""]
1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4 h5 5. Bg5 Qb6 6. Bd3!? Bxd3 7. Qxd3 Qxb2 8. e6!

If Black takes the free rook, you get a strong attack.
The only problem is that you'll have to get your opponent to play THE EXACT SEQUENCE OF MOVES, which is very difficult considering the length of the line.

user7657: I don't think anyone has mentioned the Staunton Gambit:
[FEN ""]

1.d4 f5 2.e4 fxe4 3.Nc3 Nf6

which I had the opportunity to play successfully against the computer earlier this week when it played the Dutch Defense.  It can be seen as a sounder relative of the Blackmar-Diemer Gambit (1.d4 d5 2.e4) since 1...f5 does not contribute to Black's development and leaves the black king slightly exposed, which 2.e4 aims to take advantage of. It's sufficient for dynamic equality and can provide White with a very dangerous attack if Black is not adequately prepared for it.
And the From Gambit is a strong, albeit double-edged, response to Bird's opening (1. f4 e5 2. fxe5 [2. e4 transposes to the King's Gambit] d6 3. exd6 Bxd6).  If White is careless, Black can generate some quick Fool's Mate variation kingside mating attacks based on the absence of the f2 pawn and the weakness on the e1-h4 diagonal.

user4583: I don't know whether these 2 opening positions have a name. But I have been on the losing side playing black in both these different types of games. 
At the end of the game for these 2 boards, the white wins by checkmate. And I don't think they are very trivial board positions either.
[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. Ng5 h6
5. Nxf7 Kxf7
6. Bc4+ Ke8
7. Qh5+ Ke7
8. Qf7+ Kd6    
9. Bf4+ Kc5
10. Qd5+ Kb6
11. Qb5#


[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. Bc4 h6
4. Nc3 d6
5. O-O Bg4
6. Nxe5 Bxd1
7. Bxf7+ Ke7
8. Nd5#


user4362: I would recommend the Schara-Hennig-Gambit for black:
[Title "Schara-Hennig-Gambit"]
[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 5. Qa4 Bd7 6. Qxd4 exd5 
7. Qxd5 Nf6 8. Qd1 Nc6

It is pretty rare (the Tarrasch is 10 times more common after 3…c5), according to the computer it is sound and if white doesn't know what he is doing he can go down very quickly. 
Here one of my own games, where my strong opponent started burning time after move 5 and couldn't find a way to quell the black initiative. 
[Title "2325 Elo vs BlindKungFuMaster"]
[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 5. Qa4+ Bd7 6. Qxd4 exd5
7. Qxd5 Nf6 8. Qb3 Na6 9. Nf3 Nc5 10. Qd1 Nce4 11. e3 Bb4 12. Qd4 Qe7 
13. Bd3 Rd8 14. Bxe4 Bb5 15. Qxa7 Nxe4 16. Bd2 Bxc3 17. Bxc3 O-O 
18. Qa5 Nxc3 19. bxc3 Bc4 20. Rd1 Ra8 21. Qb4 Qxb4 22. cxb4 Rxa2 
23. Nd4 Rfa8 24. h4 Rb2 25. Rh3 h5 26. b5 Bd5 27. Rg3 Raa2 
28. f3 Bc4 29. Rc1 g6 30. f4 Bd3 31. Rg5 Rf2 0-1

One word of warning: White doesn't have any structural weaknesses, so black has to come up with something before his initiative evaporates. If you are confident that you will be able to do that, the Schara-Hennig-gambit is the perfect weapon for you. 

user145: Ruy Lopez, Schliemann Defense
Very sharp response to the Ruy Lopez. In blitz it is playable at all levels. At slower time-controls, should be solid even for master play.
[FEN ""]
1. e4 e5 2. Nf3 Nc6 3. Bb5 f5


user885: The Alekhine's defence (1.e4 Nf6) is also a great attacking weapon for black, as it is a highly aggressive and provocative opening that lures white into overextending its centre, which can then be targeted (generally) via the knights on c6 and b6, trading the knight on f3 for your light square bishop, and sometimes even castling on the queen side to really target white's d pawn.
Take a look at the opening moves in the most common variations (Modern, Albert, Carlsen, 4 pawns, etc) and see if you like the resulting positions for black. It is a good practical weapon in tournament play, and white is frequently caught off-guard, as it is a rare opening (however, many world champions have played it (Fischer, Spassky, Tal, Capablanca, Alekhine, Euwe etc. and it is still sometimes used at the highest level today by Carlsen, Shabalov, Kamsky etc.)

user657: Two interesting gambit trees to be aware of are:
1) The Scotch/Goring/Italian/Danish gambit complex (there's a lot of opportunity to transpose among them). These start out with:
1. e4 e5 2. d4 ed 3. c3 (Danish)
1. e4 e5 2. Nf3 Nc6 3. d4 ed 4. c3 (Goring)
1. e4 e5 2. Nf3 Nc6 3. d4 ed 4. Bc4 (Scotch)
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d4 (Italian)

The transpositions among them (and into both the Two Knight's and the Max Lange) should be enough to gratify anyone.
2) The Blackmar-Diemer Gambit. The basic line of this is:
1. d4 d5 2. e4 de 3. Nc3 Nf6 4. f3

But the utility of this gambit lies in the great potential for transposition from semi-open e4 defenses:
1. e4 d5 2. d4 (from Center Counter)
1. e4 e6 2. d4 d5 3. Be3 de (from French)
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. a3 Bxc3 5. bc de 6. f3 (also French)
1. e4 Nf6 2. Nc3 d5 3. d4 (from Alekhine's)
1. e4 c6 2. d4 d5 3. Nc3 de 4. f3 (from Caro-Kann)

You can basically run any response to e4 except ...e5 and ...c5 and ...d6 into a BDG (and with the Sicilian or Pirc, you might find enough life in the f3 systems to keep you playing some sharp games even then).

user881: The Smith-Morra Gambit is aggressive for white.
[fen ""]
1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 (4.Bc4 cxb2 5.Bxb2)

White has sacrificed a pawn (or two) to free up his development. 

user2001: Let me recommend two sharp opening variations for the black pieces: the Sicilian Najdorf and Semi-Slav Botvinnik variation. They lead to dynamic and complicated positions with chances for both sides. They are excellent for playing for a win with the black pieces. To master one or both of these variations, I recommend getting at least one modern book per variation and study these in great detail. Also, check all grandmaster games you can find and explore the ideas for both sides in these positions.
The starting position of the Sicilian Najdorf is reached after
[FEN ""]
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

Let's try to understand this position. Black has a statically better position thanks to the semi-open c-file. This means that an exchange of queens in this position is beneficial for black. White will fight for the d5 square and try to plant a light piece there. Black will try to deliver the d6-d5 center blow, thematic for the Sicilian system. White castles queenside in the sharpest Najdorf variations. Black castles kingside, queenside or stays with the King in the center, depending on the situation. Black chooses between the setups e7-e6, e7-e5 and g7-g6. White chooses between f2-f3 and f2-f4.
When white castles queenside, black attacks with the b- and a-pawns as well as the thematic exchange sac Rc8xNc3 bxc3, ruining the queenside pawn structure. If this exchange sac can be followed by picking up the e4-pawn, then it can be done at virtually any moment. Another thematic plan for black is placing a knight on e5 (after white's f-pawn is either on f5 or exchanged off) or c4 (attacking the b2-pawn and undermining the c3-knight).
The starting position of the Semi-Slav Botvinnik is reached after
[FEN ""]
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5

At first glance, black just grabbed the c4-pawn and is trying to hold on to it for dear life. Yet things are more subtle than this. Black has entered an assymetric position where white has to find dynamic plans to compensate for the material loss. It also looks like white is winning with e4-e5. Yet again, things are not so simple at all. A bit deeper we reach the following position
[FEN ""]
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7 11.exf6

White will try to win using the extra kingside pawns. White can also launch an attack on the black King. Black will try to win by launching an attack on the white King, after developing with Bc8-b7, Qd8-b6 and O-O-O. White will most probably castle kingside, since staying in the center or castling queenside looks spooky. Black will open the a8-h1 diagonal and attack the isolated d4-pawn. I have used both these variations with joy and success. They are simply awesome!

user2329: Sicilian Defense, Dragon Variation, Yugoslav Attack
Another pretty sharp opening for both sides is The Sicilian Dragon, with the Yugoslav Attack being one of the sharpest variations. It differs from most of the openings listed here because it's not a gambit, but still a very sharp and dangerous opening with lots of threats for both White and Black.
9. Bc4  being the more aggressive move and 9. O-O-O  goes for more tactical play.
[FEN ""]
[Title "Sicilian Defense / Dragon Variation / Yugoslav Attack"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 (9. O-O-O)


user525: Indirectly Benoni Defense is one of the best opening for modern chess player. (A66)
[FEN ""]
[Title "Beoni Defense"]

1.d4 Nf6
2.c4 c5
3.d5 e6
4.Nc3 exd5
5.cxd5 d6
6.e4 g6
7.f4


user167: Sometimes, one way to get overtly aggressive in a reasonably sound way is to throw out an early g4 pawn thrust in an otherwise vanilla, mainline position. For instance, in the Anti-Meran 6.Qc2 variation of the Semi-Slav, the gambit move 7.g4!? was popularized by Shirov and Shabalov:
[fen ""]

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.g4!?

Speaking of Shirov, he pioneered a similar idea with 5.g4!? against the Pirc move-order of the Philidor Defense, and one could also try it a move earlier:
[fen ""]

1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.Nf3 (4.g4!?) e5 5.g4!?


user924: The Open Sicilian (1.e4 c5 followed by 2.Nf3 and 3.d4) counts, in my view. White immediately gets a lead in development and great attacking chances, in return for some positional sacrifice, most notably the 1v2 pawns in the center.
This opening is famous for its wild sacrificial attacks, in my opinion even more so than the king's gambit. Piece sacrifices on b5, d5 and e6, and black exchange sacrifices on c3 are the order of the day.
And best of all: almost all top players play it. It's actually good.

user1105: I can't believe that no one mentioned the Lolli attack, very similar to the fried liver attack, but the Lolli attack is better!
[FEN ""]
[Title "Lolli Attack"]

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4 exd4 7.O-O 

From there, you actually have 4 main variations, watch this youtube video, it will tell you everything you need to know about the attack.

user70: The Blackmar-Diemer Gambit: is an agressive opening.
[FEN ""]
[Title "Blackmar-Diemer Gambit"]

1. d4 d5
2. e4 dxe4
3. Nc3


user142: I've tried out the Goring gambit several times, and it has worked in ~1500 level tournament play. I don't think it's sound at the master level, but it's fun and open with lots of tactical options along the diagonals attacking the kingside.
[FEN ""]
[Title "Goring Gambit"]

1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. c3

Also, the Evans gambit. Probably also not sound at the master level, but it's quite similar, opening up the diagonals to attack the kingside after getting those pesky pawns out of the way for fast development.
[FEN ""]
[Title "Evans Gambit"]

1. e4 e5
2. Nf3 Nc6
3. Bc4 Bc5
4. b4


user258: Perhaps the most insanely aggressive opening that's remotely playable is the Halloween Gambit,
[FEN ""]
[Title "Halloween Gambit"]

1. e4 e5
2. Nf3 Nc6
3. Nc3 Nf6
4. Nxe5?!

It seems to defy logic that White can sacrifise a whole knight for merely a pawn and a speculative advantage in space and time, but sometimes aggression has a logic all its own. The White pawns roll up-board, attacking moves come naturally for White, while Black mis-steps can rapidly lead to catastrophe.
Strangely enough, Black's best idea in practical play may be to calmly counter-sac his own knight and play for a slight but sure positional advantage.
See also the Cochrane Gambit, a similar idea, but with a more distinguished pedigree.

user47: It is difficult to force an aggressive position in any opening.  Even in the King's Gambit, Black can simply play 2...d6 or Bc5 to reach a more positional type of position.
With that said, some popular openings traditionally thought to be more aggressive include the Sicilian Defence, the Dutch Defence, the Albin Counter-Gambit, the Benko Gambit, the King's Indian Defense, the Blackmar-Diemer Gambit, and an array of gambits on 1. e4.

user9030: Probably the most aggressive opening without being unplayable in chess is Double Muzio Gambit in King's Gambit, which suicide-bombs two minor pieces at f7 for a wildest possible opening attack:
[FEN ""]
[Title "Double Muzio Gambit"]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O! {Strongest continuation, Muzio gambit! White sacrifices a piece for better development and attack(a very wild one)} gxf3 6. Qxf3 Qf6 7. e5 {after Qxe5, white can play d4 with tempo, increasing deveolpment advantage} Qxe5 8.Bxf7+!!? {Double Muzio Gambit, doubles the fun, now its kill or to be killed. White has two big pieces in f-file, and also black king is on the same file, white has a clear development advantage, shortly white has the wildest possible attack in 8 moves}

I invite you to see this nice analysis about Double Muzio Gambit
I played this variation succesfully in OTB games. If you think that this can't be playable, then check this master game:
[Title "Kuznetsov, Sergei (2396) vs. Korjakin, Boris (2274) - 2007"]
[FEN ""]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5
8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Nc3 fxe3 12. Qh5+ Kg7 13. Rxf6 Nxf6
14. Qg5+ Kf7 15. Rf1 Bg7 16. Nd5 e2 17. Rxf6+  1-0

Not satified? Another master game:
[Title "Lanzani, Mario (2371) vs. Sheskin, Matan (2207) - 2010"]
[FEN ""]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5
8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Bxf4 Ne7 12. Nc3 Qf5 13. Qe3 d6
14. Bg5 Nbc6 15. g4 Bg7 16. Nb5 Qxf1+ 17. Rxf1+ Ke8 18. Bxe7 Nxe7
19. Nxc7+ Kd7 20. Nxa8 b6 21. Rf7 Be5 22. Qg5 Re8 23. Nc7 h6 24. Qh4  1-0

If you think that the line is unplayable and white is winning just because of being stronger about 130 Elo, then check this evaluation of Komodo-9.3. A GM-slayer chess engine can't find a winning advantage too:
[Title "After 10...Qf6 | Komodo-9.3 Depth:31 -0.30"]
[FEN "rnb2bnr/pppp1k1p/5q2/8/5p2/4BQ2/PPP3PP/RN3RK1 w - - 2 1"]

1. Nc3 Nc6 2. Bxf4 d6 3. Nd5 Qf5 4. Be5 Qxf3 5. Rxf3+ Bf5 6. Bxh8 Nge7
7. Nxc7 Rc8 8. Nb5 Ke6 9. g4 Bxg4 10. Rf6+ Kd7 11. Rxd6+ Ke8 12. h3 Be2
13. Nc3 Bh5 14. Ne4 Nf5 15. Nf6+ Kf7 16. Rd7+ Kg6 17. Nxh5 Bc5+ 18. Kh1 Kxh5
19. Bc3 h6 20. Re1 Bf2 21. Re6 Rf8 22. b3 Ncd4 23. Bxd4 Bxd4 24. Rxb7 Kh4
25. Kh2 Rg8 26. Rb4 {-0.30}

If it can't find, we can say that our opponents can't find over the board too. Therefore, we can say that this line is definitely not a cheap opening trap, and absolutely playable. Black seems to have only a little advantage in this very uncomfortable extremely sharp defensive position, while White is enjoying the attack.

user109: The Latvian Gambit (ECO: C40) is an agressive opening.
[FEN ""]
1. e4 e5
2. Nf3 f5


user35: As there other answers cover only white's options, let me throw in some black thoughts...
The Benko Gambit is a sharp, but sound and deep opening:
[FEN ""]
1. d4 Nf6
2. c4 c5
3. d5 b5 

The aggressive, but not-so-sound Budapest Gambit. However, if the opponent doesn't know the theory, she can be soon in serious trouble:
[FEN ""]
1. d4 Nf6
2. c4 e5
3. dxe5 Ng4  

Finally I like to play the Steinitz variation in the Scotch game, especially in blitz. If the opponent doesn't know the theory, it's quite unlikely he comes up with the only correct plan Nb1-c3-b5 by himself:
[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. Nxd4 Qh4!?


user52: The most (overly-)aggressive openings I know of that aren't too bad would probably be the Danish Gambit (Accepted) and the Fried Liver Attack.

Danish Gambit Accepted:
[FEN ""]
1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 

White gets three open files and both bishops on open diagonals facing black's king; black gets two pawns.  Usually considered slightly better for black, but played occasionally even up to master level.

Fried Liver Attack:
[FEN ""]
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6. Nxf7!? Kxf7 7. Qf3+ Ke6 8. Nc3  

White sacrifices a knight to get Black's king out right away.  Proper defense is extremely difficult over the board, but played correctly, black is thought to have a slight advantage.  In most lines, white wins their material back.

101: <p>One of my favorite openings is the <a href="//en.wikipedia.org/wiki/King%27s_Gambit" rel="noreferrer">King's Gambit</a>.  It is extremely aggressive, and makes for a sharp tactical game without sacrificing too much material.  It isn't played much at the highest level at standard time controls, but even today it is occasionally used <a href="//www.chessgames.com/perl/chessgame?gid=1600009" rel="noreferrer">in blitz</a> by top level players such as <a href="//www.chessgames.com/perl/chessgame?gid=1650151" rel="noreferrer">Hikaru Nakamura</a>.</p>
<p>What other openings for black or white would force these kind of very aggressive, tactical, sharp and open games?  (Without putting yourself in <em>too</em> bad a position.)</p>
 23691: <p>The Fried Liver is good, and according to Stockfish, black would NOT have a &quot;slight advantage&quot; even if they defend properly.</p>
 24713: <p>Luccini Gambit</p>
<pre><code>[FEN &quot;&quot;]
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 f5 5. Ng5 f4 6. Nf7 Qh4
</code></pre>
<p>Nakhmanson Gambit</p>
<pre><code>[FEN &quot;&quot;]
1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nc6 5. O-O Nxe4 6. Nc3 dxc3 7. Bxf7+ Kxf7 8. Qd5+
</code></pre>
 7266: <p>I think the second diagram in <a href="//chess.stackexchange.com/a/8319">this answer</a> is a position called Mat de Legal.<br>
This variation of the Scottish gambit is quite aggressive too:</p>

<pre><code>[FEN ""]
[Title "Scottish gambit / Mat de Legal"]

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+ 5.c3 dxc3 6.O-O *
</code></pre>
 11245: <p>I like the Colorado Counter Gambit for Black in Blitz. Here's an example:</p>

<p><strong>Colorado Counter-Gambit:</strong> </p>

<pre><code>[Event "FRG-ch corr"]
[Date "1987"]
[White "Hallier, Karl Heinz"]
[Black "Winckelmann, Thomas"]
[Result "0-1"]
[PlyCount "38"]
[Result "0-1"]
[FEN ""]

1. e4 Nc6 2. Nf3 f5 3. exf5 d5 4. Nh4 e5 5. Qh5+ g6 6. fxg6 Nf6 7. g7+ Nxh5 8.gxh8=Q Qxh4 9. d4 Bf5 10. Bd3 e4 11. Be2 O-O-O 12. g3 Bb4+ 13. c3 Qe7 14. Qxd8+ Kxd8 15. Bxh5 Nxd4 16. Bd1 Nf3+ 17. Ke2 Qc5 18. Ba4 Qc4+ 19. Kd1 Bg4 0-1
</code></pre>

<p>You might notice who was playing Black: the famous Thomas Winckelmann (of Winckelmann-Riemer Gambit fame).  <em>And</em> it was a correspondence game. <em>And</em> he beat White, who had essentially all the time in the world, in 19 moves.</p>
 11431: <p>For me, it has to be Scandinavian Alekhine. Although it could be responded by Alekhine's defence (B02), Spielmann variation and would prove better.</p>

<p>Both sides' queen, both sides' centre pawn, both sides' knight with good position lost as soon as the 7th move.</p>

<p><strong>Alekhine Defense: Scandinavian Variation:</strong> </p>

<pre><code>[Event "Computer Chess Test B02"]
[Date "2016"]
[White "Stockfish 9"]
[Black "Komodo 10"]
[Result "0-1"]
[Result "1-0"]
[FEN ""]

1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. fxg7 cxd2 6. Qxd2 Qxd2 7. Bxd2 Bxg7 8. O-O-O
</code></pre>
 13120: <p>I recommend to try Grob's Attack. This opening is very agressive for both white and black. And a lot of players don't know to play correctly in this opening as I found.</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. g4
</code></pre>

<p>Black can answer with Romford Countergambit, for example:</p>

<pre><code>[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. g4 d5 2. Bg2 Bxg4 3. c4 d4 4. Bxb7 Nd7 5. Bxa8 Qxa8 6. f3 d3
</code></pre>
 17136: <p>I personally like the Grob opening, especially for blitz.</p>
<p>It goes:</p>
<ol>
<li>g4</li>
</ol>
<p>And, just an example of a continuation:
.. d5 2. Bg2 Bxg4 3. c4 e6 4. Qb3</p>
<p>I also like using the same idea as black playing against 1. e4. For example:</p>
<ol>
<li>e4 g5 2. d4 Bg7 3. Bxg5 3. c5 4. Be3 Qb6</li>
</ol>
<p>The computer evaluation isn't always sound, but in practical play (in blitz), it works pretty well.</p>
 -1: <p>The Caveman variation (Caro-kann advance variation sideline) should do the trick:</p>
<pre><code>[FEN &quot;&quot;]
1. e4 c6 2. d4 d5 3. e5 Bf5 4. h4 h5 5. Bg5 Qb6 6. Bd3!? Bxd3 7. Qxd3 Qxb2 8. e6!
</code></pre>
<p>If Black takes the free rook, you get a strong attack.</p>
<p>The only problem is that you'll have to get your opponent to play THE EXACT SEQUENCE OF MOVES, which is very difficult considering the length of the line.</p>
 7657: <p>I don't think anyone has mentioned the Staunton Gambit:</p>

<pre><code>[FEN ""]

1.d4 f5 2.e4 fxe4 3.Nc3 Nf6
</code></pre>

<p>which I had the opportunity to play successfully against the computer earlier this week when it played the Dutch Defense.  It can be seen as a sounder relative of the Blackmar-Diemer Gambit (1.d4 d5 2.e4) since 1...f5 does not contribute to Black's development and leaves the black king slightly exposed, which 2.e4 aims to take advantage of. It's sufficient for dynamic equality and can provide White with a very dangerous attack if Black is not adequately prepared for it.
And the From Gambit is a strong, albeit double-edged, response to Bird's opening (1. f4 e5 2. fxe5 [2. e4 transposes to the King's Gambit] d6 3. exd6 Bxd6).  If White is careless, Black can generate some quick Fool's Mate variation kingside mating attacks based on the absence of the f2 pawn and the weakness on the e1-h4 diagonal.</p>
 4583: <p>I don't know whether these 2 opening positions have a name. But I have been on the losing side playing black in both these different types of games. </p>

<p>At the end of the game for these 2 boards, the white wins by checkmate. And I don't think they are very trivial board positions either.</p>

<pre><code>[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. Ng5 h6
5. Nxf7 Kxf7
6. Bc4+ Ke8
7. Qh5+ Ke7
8. Qf7+ Kd6    
9. Bf4+ Kc5
10. Qd5+ Kb6
11. Qb5#
</code></pre>

<p><br></p>

<pre><code>[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. Bc4 h6
4. Nc3 d6
5. O-O Bg4
6. Nxe5 Bxd1
7. Bxf7+ Ke7
8. Nd5#
</code></pre>
 4362: <p>I would recommend the Schara-Hennig-Gambit for black:</p>

<pre><code>[Title "Schara-Hennig-Gambit"]
[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 5. Qa4 Bd7 6. Qxd4 exd5 
7. Qxd5 Nf6 8. Qd1 Nc6
</code></pre>

<p>It is pretty rare (the Tarrasch is 10 times more common after 3…c5), according to the computer it is sound and if white doesn't know what he is doing he can go down very quickly. </p>

<p>Here one of my own games, where my strong opponent started burning time after move 5 and couldn't find a way to quell the black initiative. </p>

<pre><code>[Title "2325 Elo vs BlindKungFuMaster"]
[fen "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 cxd4 5. Qa4+ Bd7 6. Qxd4 exd5
7. Qxd5 Nf6 8. Qb3 Na6 9. Nf3 Nc5 10. Qd1 Nce4 11. e3 Bb4 12. Qd4 Qe7 
13. Bd3 Rd8 14. Bxe4 Bb5 15. Qxa7 Nxe4 16. Bd2 Bxc3 17. Bxc3 O-O 
18. Qa5 Nxc3 19. bxc3 Bc4 20. Rd1 Ra8 21. Qb4 Qxb4 22. cxb4 Rxa2 
23. Nd4 Rfa8 24. h4 Rb2 25. Rh3 h5 26. b5 Bd5 27. Rg3 Raa2 
28. f3 Bc4 29. Rc1 g6 30. f4 Bd3 31. Rg5 Rf2 0-1
</code></pre>

<p>One word of warning: White doesn't have any structural weaknesses, so black has to come up with something before his initiative evaporates. If you are confident that you will be able to do that, the Schara-Hennig-gambit is the perfect weapon for you. </p>
 145: <p><strong>Ruy Lopez, Schliemann Defense</strong></p>

<p>Very sharp response to the Ruy Lopez. In blitz it is playable at all levels. At slower time-controls, should be solid even for master play.</p>

<pre><code>[FEN ""]
1. e4 e5 2. Nf3 Nc6 3. Bb5 f5
</code></pre>
 885: <p>The Alekhine's defence (1.e4 Nf6) is also a great attacking weapon for black, as it is a highly aggressive and provocative opening that lures white into overextending its centre, which can then be targeted (generally) via the knights on c6 and b6, trading the knight on f3 for your light square bishop, and sometimes even castling on the queen side to really target white's d pawn.</p>
<p>Take a look at the opening moves in the most common variations (Modern, Albert, Carlsen, 4 pawns, etc) and see if you like the resulting positions for black. It is a good practical weapon in tournament play, and white is frequently caught off-guard, as it is a rare opening (however, many world champions have played it (Fischer, Spassky, Tal, Capablanca, Alekhine, Euwe etc. and it is still sometimes used at the highest level today by Carlsen, Shabalov, Kamsky etc.)</p>
 657: <p>Two interesting gambit trees to be aware of are:</p>

<p>1) The Scotch/Goring/Italian/Danish gambit complex (there's a lot of opportunity to transpose among them). These start out with:</p>

<pre><code>1. e4 e5 2. d4 ed 3. c3 (Danish)
1. e4 e5 2. Nf3 Nc6 3. d4 ed 4. c3 (Goring)
1. e4 e5 2. Nf3 Nc6 3. d4 ed 4. Bc4 (Scotch)
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d4 (Italian)
</code></pre>

<p>The transpositions among them (and into both the Two Knight's and the Max Lange) should be enough to gratify anyone.</p>

<p>2) The Blackmar-Diemer Gambit. The basic line of this is:</p>

<pre><code>1. d4 d5 2. e4 de 3. Nc3 Nf6 4. f3
</code></pre>

<p>But the utility of this gambit lies in the great potential for transposition from semi-open <code>e4</code> defenses:</p>

<pre><code>1. e4 d5 2. d4 (from Center Counter)
1. e4 e6 2. d4 d5 3. Be3 de (from French)
1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. a3 Bxc3 5. bc de 6. f3 (also French)
1. e4 Nf6 2. Nc3 d5 3. d4 (from Alekhine's)
1. e4 c6 2. d4 d5 3. Nc3 de 4. f3 (from Caro-Kann)
</code></pre>

<p>You can basically run any response to <code>e4</code> except <code>...e5</code> and <code>...c5</code> and <code>...d6</code> into a BDG (and with the Sicilian or Pirc, you might find enough life in the <code>f3</code> systems to keep you playing some sharp games even then).</p>
 881: <p>The Smith-Morra Gambit is aggressive for white.</p>

<pre><code>[fen ""]
1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 (4.Bc4 cxb2 5.Bxb2)
</code></pre>

<p>White has sacrificed a pawn (or two) to free up his development. </p>
 2001: <p>Let me recommend two sharp opening variations for the black pieces: the Sicilian Najdorf and Semi-Slav Botvinnik variation. They lead to dynamic and complicated positions with chances for both sides. They are excellent for playing for a win with the black pieces. To master one or both of these variations, I recommend getting at least one modern book per variation and study these in great detail. Also, check all grandmaster games you can find and explore the ideas for both sides in these positions.</p>

<p>The starting position of the Sicilian Najdorf is reached after</p>

<pre><code>[FEN ""]
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6
</code></pre>

<p>Let's try to understand this position. Black has a statically better position thanks to the semi-open c-file. This means that an exchange of queens in this position is beneficial for black. White will fight for the d5 square and try to plant a light piece there. Black will try to deliver the d6-d5 center blow, thematic for the Sicilian system. White castles queenside in the sharpest Najdorf variations. Black castles kingside, queenside or stays with the King in the center, depending on the situation. Black chooses between the setups e7-e6, e7-e5 and g7-g6. White chooses between f2-f3 and f2-f4.</p>

<p>When white castles queenside, black attacks with the b- and a-pawns as well as the thematic exchange sac Rc8xNc3 bxc3, ruining the queenside pawn structure. If this exchange sac can be followed by picking up the e4-pawn, then it can be done at virtually any moment. Another thematic plan for black is placing a knight on e5 (after white's f-pawn is either on f5 or exchanged off) or c4 (attacking the b2-pawn and undermining the c3-knight).</p>

<p>The starting position of the Semi-Slav Botvinnik is reached after</p>

<pre><code>[FEN ""]
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5
</code></pre>

<p>At first glance, black just grabbed the c4-pawn and is trying to hold on to it for dear life. Yet things are more subtle than this. Black has entered an assymetric position where white has to find dynamic plans to compensate for the material loss. It also looks like white is winning with e4-e5. Yet again, things are not so simple at all. A bit deeper we reach the following position</p>

<pre><code>[FEN ""]
1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7 11.exf6
</code></pre>

<p>White will try to win using the extra kingside pawns. White can also launch an attack on the black King. Black will try to win by launching an attack on the white King, after developing with Bc8-b7, Qd8-b6 and O-O-O. White will most probably castle kingside, since staying in the center or castling queenside looks spooky. Black will open the a8-h1 diagonal and attack the isolated d4-pawn. I have used both these variations with joy and success. They are simply awesome!</p>
 2329: <p><strong>Sicilian Defense, Dragon Variation, Yugoslav Attack</strong></p>

<p>Another pretty sharp opening for both sides is The Sicilian Dragon, with the <a href="//en.wikipedia.org/wiki/Sicilian_Defence,_Dragon_Variation#Yugoslav_Attack" rel="nofollow noreferrer">Yugoslav Attack</a> being one of the sharpest variations. It differs from most of the openings listed here because it's not a gambit, but still a very sharp and dangerous opening with lots of threats for both White and Black.</p>

<p><code>9. Bc4</code>  being the more aggressive move and <code>9. O-O-O</code>  goes for more tactical play.</p>

<pre><code>[FEN ""]
[Title "Sicilian Defense / Dragon Variation / Yugoslav Attack"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. Bc4 (9. O-O-O)
</code></pre>
 525: <p><strong>Indirectly <a href="//en.wikipedia.org/wiki/Benoni_Defense" rel="nofollow noreferrer">Benoni Defense</a> is one of the best opening for modern chess player. (A66)</strong></p>

<pre><code>[FEN ""]
[Title "Beoni Defense"]

1.d4 Nf6
2.c4 c5
3.d5 e6
4.Nc3 exd5
5.cxd5 d6
6.e4 g6
7.f4
</code></pre>
 167: <p>Sometimes, one way to get overtly aggressive in a reasonably sound way is to throw out an early g4 pawn thrust in an otherwise vanilla, mainline position. For instance, in the Anti-Meran <code>6.Qc2</code> variation of the Semi-Slav, the gambit move <code>7.g4!?</code> was popularized by Shirov and Shabalov:</p>

<pre><code>[fen ""]

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.g4!?
</code></pre>

<p>Speaking of Shirov, he pioneered a similar idea with <code>5.g4!?</code> against the Pirc move-order of the Philidor Defense, and one could also try it a move earlier:</p>

<pre><code>[fen ""]

1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.Nf3 (4.g4!?) e5 5.g4!?
</code></pre>
 924: <p>The Open Sicilian (1.e4 c5 followed by 2.Nf3 and 3.d4) counts, in my view. White immediately gets a lead in development and great attacking chances, in return for some positional sacrifice, most notably the 1v2 pawns in the center.</p>
<p>This opening is famous for its wild sacrificial attacks, in my opinion even more so than the king's gambit. Piece sacrifices on b5, d5 and e6, and black exchange sacrifices on c3 are the order of the day.</p>
<p>And best of all: almost all top players play it. It's actually <em>good</em>.</p>
 1105: <p>I can't believe that no one mentioned the Lolli attack, very similar to the fried liver attack, but the Lolli attack is better!</p>

<pre><code>[FEN ""]
[Title "Lolli Attack"]

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4 exd4 7.O-O 
</code></pre>

<p>From there, you actually have 4 main variations, watch <a href="//www.youtube.com/watch?v=ZmF64w13ZU8" rel="nofollow noreferrer">this youtube video</a>, it will tell you everything you need to know about the attack.</p>
 70: <p>The <a href="//en.wikipedia.org/wiki/Blackmar%E2%80%93Diemer_Gambit" rel="nofollow noreferrer">Blackmar-Diemer Gambit</a>: is an agressive opening.</p>
<pre><code>[FEN &quot;&quot;]
[Title &quot;Blackmar-Diemer Gambit&quot;]

1. d4 d5
2. e4 dxe4
3. Nc3
</code></pre>
 142: <p>I've tried out the Goring gambit several times, and it has worked in ~1500 level tournament play. I don't think it's sound at the master level, but it's fun and open with lots of tactical options along the diagonals attacking the kingside.</p>
<pre><code>[FEN &quot;&quot;]
[Title &quot;Goring Gambit&quot;]

1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. c3
</code></pre>
<p>Also, the Evans gambit. Probably also not sound at the master level, but it's quite similar, opening up the diagonals to attack the kingside after getting those pesky pawns out of the way for fast development.</p>
<pre><code>[FEN &quot;&quot;]
[Title &quot;Evans Gambit&quot;]

1. e4 e5
2. Nf3 Nc6
3. Bc4 Bc5
4. b4
</code></pre>
 258: <p>Perhaps the most insanely aggressive opening that's remotely playable is the <strong><a href="//web.archive.org/web/20121025210610/http://www.chessville.com/UCO/Halloween_Gambit/Part_1.htm" rel="nofollow noreferrer">Halloween Gambit</a></strong>,</p>
<pre><code>[FEN &quot;&quot;]
[Title &quot;Halloween Gambit&quot;]

1. e4 e5
2. Nf3 Nc6
3. Nc3 Nf6
4. Nxe5?!
</code></pre>
<p>It seems to defy logic that White can sacrifise a whole knight for merely a pawn and a speculative advantage in space and time, but sometimes aggression has a logic all its own. The White pawns roll up-board, attacking moves come naturally for White, while Black mis-steps can rapidly lead to catastrophe.</p>
<p>Strangely enough, Black's best idea in practical play may be to <a href="//www.chessgames.com/perl/chessgame?gid=1433474" rel="nofollow noreferrer">calmly counter-sac his own knight</a> and play for a slight but sure positional advantage.</p>
<p>See also the <strong><a href="//web.archive.org/web/20121014131226/http://www.chessville.com/instruction/Openings/CochraneGambit.htm" rel="nofollow noreferrer">Cochrane Gambit</a></strong>, a similar idea, but with a more distinguished pedigree.</p>
 47: <p>It is difficult to force an aggressive position in any opening.  Even in the King's Gambit, Black can simply play <code>2...d6 or Bc5</code> to reach a more positional type of position.</p>
<p>With that said, some popular openings traditionally thought to be more aggressive include the Sicilian Defence, the Dutch Defence, the Albin Counter-Gambit, the Benko Gambit, the King's Indian Defense, the Blackmar-Diemer Gambit, and an array of gambits on <code>1. e4</code>.</p>
 9030: <p>Probably <strong>the most aggressive opening without being unplayable</strong> in chess is <strong>Double Muzio Gambit</strong> in King's Gambit, which <strong>suicide-bombs two minor pieces at f7 for a wildest possible opening attack</strong>:</p>

<pre><code>[FEN ""]
[Title "Double Muzio Gambit"]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O! {Strongest continuation, Muzio gambit! White sacrifices a piece for better development and attack(a very wild one)} gxf3 6. Qxf3 Qf6 7. e5 {after Qxe5, white can play d4 with tempo, increasing deveolpment advantage} Qxe5 8.Bxf7+!!? {Double Muzio Gambit, doubles the fun, now its kill or to be killed. White has two big pieces in f-file, and also black king is on the same file, white has a clear development advantage, shortly white has the wildest possible attack in 8 moves}
</code></pre>

<p>I invite you to see this nice analysis about <a href="http://www.millican.org/chess/muzio.pdf" rel="noreferrer">Double Muzio Gambit</a></p>

<p>I played this variation succesfully in OTB games. If you think that this can't be playable, then check this master game:</p>

<pre><code>[Title "Kuznetsov, Sergei (2396) vs. Korjakin, Boris (2274) - 2007"]
[FEN ""]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5
8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Nc3 fxe3 12. Qh5+ Kg7 13. Rxf6 Nxf6
14. Qg5+ Kf7 15. Rf1 Bg7 16. Nd5 e2 17. Rxf6+  1-0
</code></pre>

<p>Not satified? Another master game:</p>

<pre><code>[Title "Lanzani, Mario (2371) vs. Sheskin, Matan (2207) - 2010"]
[FEN ""]

1. e4 e5 2. f4 exf4 3. Nf3 g5 4. Bc4 g4 5. O-O gxf3 6. Qxf3 Qf6 7. e5 Qxe5
8. Bxf7+ Kxf7 9. d4 Qxd4+ 10. Be3 Qf6 11. Bxf4 Ne7 12. Nc3 Qf5 13. Qe3 d6
14. Bg5 Nbc6 15. g4 Bg7 16. Nb5 Qxf1+ 17. Rxf1+ Ke8 18. Bxe7 Nxe7
19. Nxc7+ Kd7 20. Nxa8 b6 21. Rf7 Be5 22. Qg5 Re8 23. Nc7 h6 24. Qh4  1-0
</code></pre>

<p>If you think that the line is unplayable and white is winning just because of being stronger about 130 Elo, then check this evaluation of Komodo-9.3. A GM-slayer chess engine can't find a winning advantage too:</p>

<pre><code>[Title "After 10...Qf6 | Komodo-9.3 Depth:31 -0.30"]
[FEN "rnb2bnr/pppp1k1p/5q2/8/5p2/4BQ2/PPP3PP/RN3RK1 w - - 2 1"]

1. Nc3 Nc6 2. Bxf4 d6 3. Nd5 Qf5 4. Be5 Qxf3 5. Rxf3+ Bf5 6. Bxh8 Nge7
7. Nxc7 Rc8 8. Nb5 Ke6 9. g4 Bxg4 10. Rf6+ Kd7 11. Rxd6+ Ke8 12. h3 Be2
13. Nc3 Bh5 14. Ne4 Nf5 15. Nf6+ Kf7 16. Rd7+ Kg6 17. Nxh5 Bc5+ 18. Kh1 Kxh5
19. Bc3 h6 20. Re1 Bf2 21. Re6 Rf8 22. b3 Ncd4 23. Bxd4 Bxd4 24. Rxb7 Kh4
25. Kh2 Rg8 26. Rb4 {-0.30}
</code></pre>

<p>If it can't find, we can say that our opponents can't find over the board too. Therefore, we can say that this line is definitely not a cheap opening trap, and absolutely playable. Black seems to have only a little advantage in this very uncomfortable extremely sharp defensive position, while White is enjoying the attack.</p>
 109: <p>The <a href="//en.wikipedia.org/wiki/Latvian_Gambit" rel="nofollow noreferrer">Latvian Gambit</a> (ECO: C40) is an agressive opening.</p>
<pre><code>[FEN &quot;&quot;]
1. e4 e5
2. Nf3 f5
</code></pre>
 35: <p>As there other answers cover only white's options, let me throw in some black thoughts...</p>
<p>The <a href="//en.wikipedia.org/wiki/Benko_Gambit" rel="nofollow noreferrer">Benko Gambit</a> is a sharp, but sound and deep opening:</p>
<pre><code>[FEN &quot;&quot;]
1. d4 Nf6
2. c4 c5
3. d5 b5 
</code></pre>
<p>The aggressive, but not-so-sound <a href="//en.wikipedia.org/wiki/Budapest_Gambit" rel="nofollow noreferrer">Budapest Gambit</a>. However, if the opponent doesn't know the theory, she can be soon in serious trouble:</p>
<pre><code>[FEN &quot;&quot;]
1. d4 Nf6
2. c4 e5
3. dxe5 Ng4  
</code></pre>
<p>Finally I like to play the <a href="//en.wikipedia.org/wiki/Scotch_Game#4...Qh4.21.3F" rel="nofollow noreferrer">Steinitz variation in the Scotch game</a>, especially in blitz. If the opponent doesn't know the theory, it's quite unlikely he comes up with the only correct plan Nb1-c3-b5 by himself:</p>
<pre><code>[FEN &quot;&quot;]
1. e4 e5
2. Nf3 Nc6
3. d4 exd4
4. Nxd4 Qh4!?
</code></pre>
 52: <p>The most (overly-)aggressive openings I know of that aren't <em>too</em> bad would probably be the Danish Gambit (Accepted) and the Fried Liver Attack.</p>
<hr />
<p><strong>Danish Gambit Accepted</strong>:</p>
<pre><code>[FEN &quot;&quot;]
1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 
</code></pre>
<p><em>White gets three open files and both bishops on open diagonals facing black's king; black gets two pawns.  Usually considered slightly better for black, but played occasionally even up to master level.</em></p>
<hr />
<p><strong>Fried Liver Attack:</strong></p>
<pre><code>[FEN &quot;&quot;]
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6. Nxf7!? Kxf7 7. Qf3+ Ke6 8. Nc3  
</code></pre>
<p><em>White sacrifices a knight to get Black's king out right away.  Proper defense is extremely difficult over the board, but played correctly, black is thought to have a slight advantage.  In most lines, white wins their material back.</em></p>
