The Komodo Bites! -Zahak vs Komodo Dragon -’s Gambit Declined, Ragozin Defense, Alekhine Variation

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The Queen’s Gambit Declined (or QGD) is a chess opening in which Black declines a pawn offered by White in the Queen’s Gambit:

1. d4 d5
2. c4 e6

Queen’s Gambit Declined: Three Knights Variation

Moves 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3
Parent Queen’s Gambit Declined
The Three Knights Variation of the Queen’s Gambit Declined is usually reached from the move order 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3, played to avoid the Nimzo-Indian Defense (from the white point of view) and the Exchange Variation of the Queen’s Gambit Declined (from the black point of view). Black has a few options in response to the Three Knights Variation.

Vienna Variation: 4…dxc4 [edit]
The Vienna Variation occurs after black plays 4…dxc4 in the Three Knights Variation. The main line of the Vienna continues as 5.e4 Bb4 6.Bg5. White’s pawns or pieces occupy the central squares in exchange for long-term pawn structure weaknesses. An instance of Vienna Variation played at the highest level was Fine–Euwe, AVRO 1938. The Quiet Variation of the Vienna Variation occurs after 5.e3.

Semi-Tarrasch Defense: 4…c5 [edit]
The Semi-Tarrasch Defense occurs after black plays 4…c5 in the Three Knights Variation. An important line in this variation is the Endgame Line where the game continues: 5.cxd5 cxd4 6.Qxd4 exd5 7.e4 dxe4 8.Qxd8+ Kxd8 where the queens get traded off in a similar fashion to the Endgame in the Berlin Defense, resulting in a drawish position.[10] This line has been played by top grandmasters such as Wesley So, Anish Giri, and Magnus Carlsen aiming for a draw. There is also the Exchange Variation where the game continues 5.cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4, which has been used by played by the likes of Ding Liren, Anish Giri, Vladimir Kramnik, and Magnus Carlsen.

Ragozin Variation: 4…Bb4 [edit]
The Ragozin Variation (ECO code D37–D39) occurs after black plays 4…Bb4 in the Three Knights Variation. The Alekhine Variation of the Ragozin Variation occurs with 5.Qa4 Nc6 6.e3 O-O 7.Qc2. A transposition into the Vienna Variation of the Queen’s Gambit Declined occurs with 5. Bg5 dxc4 6. e4. An alternate line commonly played is 5.cxd5 exd5 6.Bg5 h6 7.Bh4 to avoid transposing into the Vienna.

PGN OF THE GAME:

[Event “TCEC Season 23 – Chess Bonus”]
[Site “https://tcec-chess.com“]
[Date “2022.08.09”]
[Round “2.9”]
[White “Zahak 10.0”]
[Black “KomodoDragon 3.1”]
[Result “0-1”]
[WhiteElo “3325”]
[BlackElo “3603”]
[Variant “Standard”]
[TimeControl “1800+3”]
[ECO “D38”]
[Opening “Queen’s Gambit Declined: Ragozin Defense, Alekhine Variation”]
[Termination “Unknown”]
[Annotator “lichess.org”]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Qa4+ { D38 Queen’s Gambit Declined: Ragozin Defense, Alekhine Variation } Nc6 6. e3 O-O 7. Qc2 Re8 8. Bd2 Bf8 9. Be2 dxc4 10. Bxc4 Nb4 11. Qb3 c5 12. dxc5 Nd3+ 13. Bxd3 Qxd3 14. Nb5 Qd8 15. Bb4 a5 16. Ba3 a4 17. Qc4 Bd7 18. O-O Qa5 19. Nbd4 Rac8 20. Bb4 Qc7 21. Rac1 Qb8 22. Qe2 e5 23. Nb5 e4 24. Nfd4 Qe5 25. Nd6 Bxd6 26. cxd6 Ng4 27. g3 Qf6 28. Rc7 Rxc7 29. dxc7 Ne5 30. Rc1 Rc8 31. Qd2 Bh3 32. a3 h5 33. Qe2 h4 34. Rc5 Bd7 35. Rc2 h3 36. Rc3 Bg4 37. Qb5 Nf3+ 38. Nxf3 Qxf3 39. Qf1 Bd7 40. Rc1 b6 41. Bd6 g5 42. Rc4 g4 43. Rb4 b5 44. Be5 Be6 45. Rd4 f6 46. Rd8+ Kf7 47. Bd6 Rxc7 48. Bxc7 Bc4 49. Rd7+ Kg6 50. Rd4 Bxf1 51. Kxf1 Qh1+ 52. Ke2 Qxh2 53. Rxe4 Qg1 54. Rxg4+ Kf7 55. Rh4 h2 56. Ba5 h1=Q 57. Rxh1 Qxh1 58. Be1 Qg2 59. Bc3 Ke6 60. Bd4 Kf5 61. b3 axb3 62. Kd2 b2 63. Bxb2 Qxf2+ 64. Kc3 Qxe3+ 65. Kb4 Qd2+ 66. Bc3 Qxc3+ 67. Kxc3 { Black wins. } 0-1