Aggressive Reply Against D4

Hi, my team made it to the regional finals for chess this Friday. The person that i am versing is 900 rated and plays the Queens Gambit. I don't really have any experience against the queen's gambit so could you suggest any good, aggressive openings for black against D4. 

Thanks. 

Thanks for the reply. 

However i thought i might try the Benoni. would i need to know the lines of it to play it as i dont really have much time to learn it. Also, could you provide a brief outline on the theory and strategies of it. 

Thanks alot. 

That's what he meant by "the Benoni". Not sure I would recommend it for a player of your level, since it gives White a space advantage and Black's moves will be harder to find than White's moves.

The Queen's Gambit Accepted or the Albin Counter-Gambit (both already suggested above) will give you open piece-play, which is probably what you are looking for at your level of strength.

The Dutch is another possibility.

My comment should have been "for a player of his level", of course... not you.

Learn to defend the Exchange Slav and you have a solid active defense against 1.d4 that is not easy to counter. The Classical Slav is maybe the simplest to learn at the start. I used to wing the Modern Benoni as a 1900 player with some success against players near my rating (with absolute disasters in encounters with a 2100 and a 2300), but I don't think I'd recommend it to a beginner. You can try something tricky like the Albin or Hennig-Schara Gambits, but you have to learn something against 2.Nf3 move orders.

Sorry, by 900 i meant that his junior chess rating, so his FIDE would be around 1700. So he is not a begineer and knows most of the lines to the replies to D4 such as the albin counter gambit. 

However, thanks for the suggestions. 

The aggressive responses against 1.d4 in general (Queen pawn opening)

1. Kings Indian Defense
2. Dutch Defense (especially the Leningrad)
3. Modern Benoni 

Available aggressive responses against Queens Gambit (1. d4 d5 2.c4) 

1. Queens Gambit Accepted
2. Albin counter-gambit QGD
3. Some lines of "Semi-Slav too (Don't confuse with "Slav" which is solid and not aggressive)

When you chosen to play 1...d5 your further choices generally lead to lesser aggressive paths than KID or Dutch or MB would have have.

I agree with ^^^