Black plays an early ... d5? in The English

I played another English Opening today and was surprised by my opponent's response to 1. c4. He replied back with 1... d5. As far as I know, this is a rather weak move, and there's no decent lines that follow this gambit. I had played my opponent previously, and he's fairly decent, so I think he must have been unfamiliar with the English or perhaps just trying something out. The whole point of the early d5 by black is to recapture with his queen, but it just leaves her open to being chased around.

1. c4 d5
2. cxd5 Qxd5
3. Nc3 Qd7

As mentioned, he offered up his d-pawn to take back and get rapid development of his queen. Unfortunately, this doesn't work since the knight can be brought up to attack to queen forcing her to retreat.

4. d4 Nc6
5. d5 Nb4
6. a3 Na6

I pushed forward to grab the center with my d-pawn and he brought out his queen's knight. This was another mistake he made - allowing me to advance the d-pawn, backed up by my queen, to attack his knight. He moved it out of the way, but allowed me to chase it into a corner with my a-pawn. Much stronger would have been for him to try and grab e5 with it.

7. e4 e6
8. Nf3 exd5
9. Nxd5 c6

I made a few developing moves - grabbing the center with my e-pawn and bring out the other knight. He took my d-pawn and I took back with my knight supported by the e-pawn.

10. Bxa6 cxd5
11. Ne5 Qd6
12. Bb5+ Ke7

I took his knight with my bishop. I was expecting him to take the bishop back and double up his pawns, but he surprised me by taking my knight in the center. I was able to land my knight on e5, further attacking his queen. He brought his queen down, forking my knight and bishop, but wasn't able to back it up as I dodged with my bishop by checking the king. He had no choice but to start bringing his king into the center (Kd8 leaves the king and rook open to being forked by the knight).

13. Bf4 Qc5
14. Ba4 dxe4
15. Rc1 Qa5+

I brought out my bishop to support the center knight and he went after my bishop with his queen. I still had a defended square to retreat through though to be able to hold the diagonal. He had very little hold on the center with both his queen and king exposed. I brought my rook out to further limit the scope of the queen and he retreated her over to the side, checking my king.

16. b4 Qa6
17. Rc7+ Ke6

I attacked her with my b-pawn, causing her to yet again retreat. This allowed me to take control of the 7th rank with my rook - a rook on the 7th is a huge advantage!

18. Bb3+ Kf5
19. Qg4+ Kf6
20 Rxf7#

After that, it was just a simple matter of repeatedly checking his king into checkmate!

I had put up a post last month about the dangers of early queen development. As is evidenced here, it is a very risky strategy leaving her to be chased around while your opponent gets to develop!