What is the best continuation for Black?

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thokkubabu (1660) vs. john2001plus (1867)

1 2 3 4 5 6 7 8 h g f e d c b a +4

(black to move) 1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 Nf6 5. Nc3 Bb4 6. Be2 Ne4 7. Qa4+ Nc6 8. Bd2 Nxd2 9. Kxd2 O-O 10. Nf3 dxc4 11. Rad1 Nxd4 12. Kc1 Bxc3 13. Qxc4 Be6 14. Rxd4 Bxd4 15. Qxd4 Bxa2

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Pawn promotion:
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Click here for 14. Qd3.