Wojtaszek - Morozevich | Black sacrificies an exchange for dark square control

In this last round of world blitz Wojtaszek is playing Morozevich. Radoslav plays d4 and Black goes for Benoni structure. Alexandr quickly sacrifices exchange on e3: normally black will want at least a pawn, but Alexander plays this position just exchange down. Black has control over dark squares and safer king.
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The Benoni Defense is a chess opening characterized by the moves:

1. d4 Nf6
2. c4 c5
3. d5

Black can then sacrifice a pawn with 3...b5 (the Benko Gambit), otherwise 3...e6 is the most common move (although 3...d6 or 3...g6 are also seen, typically transposing to main lines).

This opening was first popularized by Mikhail Tal, "The magician from Riga", who played many brilliancies with this defense. In fact, The Modern Benoni was one of Mikhail Tal's greatest weapons and helped him to earn a shot at the world chess championship in 1960.

Many top chess grandmasters also used the Benoni like Bobby Fischer, Garry Kasparov, Petrossian, Geller and Spassky.

2019 King Salman World Rapid & Blitz Championships
Moscow, 2019

Wojtaszek, Radoslaw - Morozevich, Alexander
World Blitz Championship 2019 round 21
1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 Bg7 5. e4 d6 6. Bd3 O-O 7. h3 e6 8. Nf3 exd5 9. exd5 Re8+ 10. Be3 Rxe3+ 11. fxe3 Qe7 12. e4 Nbd7 13. O-O Ne5 14. Nxe5 Qxe5 15. Qf3 Bd7 16. Rad1 Rf8 17. Qf4 Qe7 18. Be2 Ne8 19. Bg4 Be5 20. Qh6 Bxg4 21. hxg4 Nf6 22. Qh4 Kg7 23. Rd3 h5 24. Rh3 Rh8 25. Rff3 Bd4+ 26. Kh1 Qe5 27. gxh5 Rxh5 28. Qg3 Rxh3+ 29. gxh3 Qh5 30. Kg2 Be5 31. Qf2 Qg5+ 32. Kf1 Qc1+ 33. Kg2 Qg5+ 34. Kf1 Qc1+ 35. Kg2 ½-½

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Blitz chess (also known as speed or fast chess) is a type of chess in which each player is given less time to consider their moves than normal tournament time controls allow. Openings, tactics and strategy are same.