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Recently I have been playing the Evans Gambit as many times as I can and for the most part, black plays 4...Bxb4, but someone played 4...Nxb4 and I wasn't sure how to continue. After the following moves below, how should I continue with the Evans Gambit as white?

[FEN ""]
1. e4 e5
2. Nf3 Nc6
3. Bc4 Bc5
4. b4  Nxb4
5. c3  Nc6
6. d4  exd4
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up vote 7 down vote accepted

4...Nxb4 directly transposes to the main line with 4...Bxb4 5. c3 Bc5.

In that line, white usually plays 6. d4 exd4 7. O-O!.

Black cannot take the pawn on c3 because of 8. Bxf7+! Kxf7 9. Qd5+ picking off the bishop on c5 with an overwhelming advantage.

[FEN ""]
1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Nxb4 (4... Bxb4 5. c3 Bc5) 5. c3 Nc6 6. d4 exd4 7. O-O $1 dxc3 $2 8. Bxf7+ $1 Kxf7 9. Qd5+
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Andrew, I am slightly confused, how can 4...Nxb4 transpose into 4...Bxb4.... After 4...Nxb4, is it correct to play 5. d4 – xaisoft Jan 17 '13 at 16:02
@xaisoft I added a replayer to help you out. In the Evan's Accepted, white always plays 5. c3. After 5... Nc6, it is the exact same position as the main line with 5... Bc5. – Andrew Jan 17 '13 at 16:17
OK, it makes sense now. I made the mistake of 7. cxd4 instead of 7. O-O. – xaisoft Jan 17 '13 at 16:32
The transposition still is a little weird to me, but let me know if I have it right: Are you saying that since the Black Knight went back to c6, it is as if the Bishop captured the b4 pawn and went back to c5 and we are essentially back were we started. – xaisoft Jan 17 '13 at 16:34
@xaisoft, yes, that is exactly correct. Check out the pgn viewer above, the position is the same after black's 5th move in both the main line and the variation. – Andrew Jan 17 '13 at 16:44

Answering the original question: after 4...Nb4 5.Ne5 (threatens 6.Nf7 or Bf7+) if 5...Nh6 6.d4? Bd6? 7.Bh6 Be5 then things go wild with 8.Bf7+ Kf7 9.Qh5+ & then 10.Qe5 but Black has a fork with check in hand ...Nc2+ but White has the attack.

    However instead of 6...Bd6?, Black has 6...Bd4! as 7.Qd4 fails to 

So White needs 6.c3 before 7.d4. Basically instead of the original 4...Nb4 5.c3 ... ,
try 4...Nb4 5.Ne5 Nh6 6.c3 and the position looks good for White.

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Why is 5... Nh6 necessary? Why not 5... d5!? or 5... Qf6 6. d4 Bxd4!. – Dag Oskar Madsen May 16 '15 at 17:39

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