Andreikin - Dreev | Black doesn't allow white stabilise | Slav defense

Dmitry Andreikin, ranking favorite of this game chose d4 as an opening move. Dreev opted for Slav defense main line with bg4. Even though h3 and g4 looks provocative, white get two bishops which is serious advantage at top level. However veteran Dreev is ready for this game and plays very actively before white can stabilize their position and start pressing black.

2019 King Salman World Rapid & Blitz Championships
Moscow, 2019
Andreikin, Dmitry - Dreev, Aleksey
World Blitz Championship 2019 round 11
1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. e3 Bg4 5. h3 Bh5 6. Nc3 e6 7. g4 Bg6 8. Ne5 Nbd7 9. Nxg6 hxg6 10. a3 g5 11. Bd2 Be7 12. Qf3 Nb6 13. b3 Rc8 14. c5 Nbd7 15. b4 Qc7 16. Bg2 Nf8 17. Qe2 Ng6 18. O-O-O b6 19. Kc2 e5 20. dxe5 Qxe5 21. cxb6 axb6 22. f4 gxf4 23. exf4 Qxe2 24. Nxe2 Nh4 25. Bf1 c5 26. bxc5 Bxc5 27. Kb3 O-O 28. Be1 Nf3 29. Bg2 Nxe1 30. Rhxe1 Rfe8 31. Nc3 Rxe1 32. Rxe1 Bxa3 33. g5 Nh5 34. Nxd5 Bd6 35. f5 Nf4 36. Nxf4 Bxf4 37. g6 Kf8 38. Bd5 fxg6 39. fxg6 Bh6 40. Bf7 Bg5 41. Re4 Bf6 42. Kb4 Be7+ 43. Kb5 Rc5+ 44. Kxb6 Rh5 45. Rc4 Bf6 46. Re4 Re5 47. Ra4 Rh5 48. Ra8+ Ke7 49. Ra7+ Kd6 50. Ra4 Rxh3 51. Kb5 Ke5 1/2 - 1/2

The Slav Defense is a chess opening that begins with the moves:

1. d4 d5
2. c4 c6

The Slav is one of the primary defenses to the Queen's Gambit. Although it was analyzed as early as 1590, it was not until the 1920s that it started to be explored extensively. Many masters of Slavic descent helped develop the theory of this opening, including Alapin, Alekhine, Bogoljubov, and Vidmar.

The Slav received an exhaustive test during the two Alekhine–Euwe World Championship matches in 1935 and 1937. Played by 11 of the first 13 world champions, this defense was particularly favored by Euwe, Botvinnik, and Smyslov. More recently the Slav has been adopted by Anand, Ivanchuk, Lautier, Short, and other top grandmasters, including use in six of the eight games that Vladimir Kramnik played as Black in the 2006 World Championship (in the other two, he played the related Semi-Slav Defense).
Today the theory of the Slav is very extensive and well-developed.
General considerations

There are three main variations of the Slav:

The "Pure" Slav or Main Line Slav where Black attempts to develop the light-squared bishop to f5 or g4.
The a6 Slav or Chebanenko Slav with 4...a6.
The Semi-Slav with ...e6 (without developing the light-squared bishop). The Semi-Slav Defense, a kind of a combination Queen's Gambit Declined and Slav Defense, is a very complex opening in its own right.
There is also a lesser option, the Schlechter Slav with ...g6

Black faces two major problems in many variations of the Queen's Gambit Declined (QGD):

Development of his queen bishop is difficult, as it is often blocked by a black pawn on e6.
The pawn structure offers White targets, especially the possibility of a minority attack on the queenside in the QGD Exchange Variation.

The "Pure" Slav and a6 Slav addresses these problems. Black's queen bishop is unblocked; the pawn structure remains balanced. Also, if Black later takes the gambit pawn with ...dxc4, the support provided by the pawn on c6 (and possibly ...a6) allows ...b5 which may threaten to keep the pawn, or drive away a white piece that has captured it, gaining Black a tempo for queenside expansion. On the other hand, Black usually will not be able to develop the queen bishop without first giving up the center with ...dxc4, developing the bishop may leave the black queenside weak, and the thematic break ...c5 incurs the loss of a tempo.

The Slav can be entered by many move orders. The possibilities include 1.d4 d5 2.Nf3 Nf6 3.c4 c6, 1.Nf3 d5 2.c4 c6 3.d4 Nf6, and so on.
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