Double Exchange Sacrifice « Chess Strategy

Double Exchange Sacrifice

25 Jun, 2010 Lessons, Positional Sacrifice

While exchange sacrifice is a very common strategical tool for achieving positional transformation, a double exchange sacrifice is rare guest in the tournament practice. The material deficit is bigger and it is harder to obtain positional compensation. In addition, the opponent can always be alert to give one exchange back and kill the counterplay, while still keeping some extra material at hand.

In our example we have a setup that resembles pawn structure resulting from Nimzo-Indian or Ragozin defence. White’s position looks very appealing at the first glance. He has pair of Bishops and prepares to roll the central pawns with e3-e4. Black h5-pawn also seems to be running ahead of the time and can become target for White pieces.

White’s next move looks natural, the Knight presses h5 and supports the advance e3-e4.

27. Ng3 Rxe3!
Black is not interested in passive defence and instead sacrifices an exchange to abruptly change the nature of the position. He doesn’t have to worry about e4 anymore, White c3-pawn suddenly becomes a target and White Queen is sidelined on h4.

28. Bxe3 Rxe3 29. Nxh5 Nxh5 30. Qxh5 Bc6

At the end of the forced variation Black is protecting d5-pawn. White’s positional advantage has disappeared and now he has to search for tactical possibilities to use the extra exchange. But Black Knight provides excellent cover for the King and c3-pawn is also hanging. Allowing two connected passed pawns would be a bit too much.

However, it is now easy to protect the pawn. The natural 31. Ra3 weakens the back-rank and Black wins with 31…Re1+ 32. Kh2 Qc7+ 33. g3 Qe7! when Ra3 is hanging and Black threatens Qe2+.

White is trying to “trap” the Black Rook.

31. Qg5 Rxc3!
But Black doesn’t care, he wants to eliminate the obstacle on the way of his pawns.

32. Qd2 Rxc2 33. Rxc2 Ne6
The Rook was trapped on c3 and Black sacrificed another exchange. The benefits are obvious, Black has two connected and quickly advancing pawns, while d4 is also hanging. White heavy pieces do not have space and files to attack the enemy King. Still, Black should always be wary not to allow this possibility.

34. Rd1 b4

35. Rb2 b3 36. Qc3 Nc7
Now Black is preparing to offer Queens exchange. As mentioned above, this would effectively deny any possibility of counterplay against Black King. With only two Rooks on the board White cannot stop the charging pawns because the Rooks are actually not suitable for defending tasks.

37. Re2 Qa7 38. Qb4
38. Ra1 is also met with 38…Nb5, Black is happy to trade the Queens.

38…Nb5! 39. Re7 Qa3 40. Qe1 c3 41. Re8+ Bxe8
Remember the introduction? We were warned of the option of giving one exchange back. White is hoping to finally come closer to the Black King.

42. Qxe8+ Kh7 43. Qxf7 Qa8!
Denies perpetual check. 43. Qxb5 was breaking against 43…c2.