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Normal Topic Why does the Modern Exchange work? (Read 2535 times)
Bonsai
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Re: Why does the Modern Exchange work?
Reply #1 - 01/20/17 at 12:22:14
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One tempo matters a lot here, e.g. 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 0-0? is a known mistake and 7...c5 must be played. Similarly, 7...c5 8. Be2? already gives up any realistic hope of an advantage for white (while moves like 8.Rb1 or 8.Be3 are good tries).

This is not, because 7...0-0 or 8.Be2 are per-se bad moves that do not fit into the position, but rather because there are more urgent things that need to be done: Instead of 7....0-0 black needs to immeditely challenge the center without any loss of time and in the case of 8.Be2 it is crucial to do something about the pressure on d4 instead (either preparing d4-d5 in response to 8...Nc6 by 8.Rb1, or covering d4 once more with 8.Be3), while preparing to castle can wait for a bit.
  
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RdC
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Why does the Modern Exchange work?
01/19/17 at 10:15:21
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Critical lines in the Grunfeld can start with 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 

I have also been looking at the reversed version of the position after 1. Nf3 d5 2. g3 c5 3. Bg2 Nc6 4. d4 cxd4 5. Nxd4 e5 6. Nxc6 bxc6 7. O-O Nf6.

In practice this reversed variation can do well for White. So what are the differences? White has castled which rules out the Bishop checks which are possible idea if Black plays .. c5 before castling. Later, that White usually plays Rb1 can be a key point as the threat to the b7 pawn inhibits .. Bg4. Also there's a variation where White pushes forward with d5, leaving c3 as a sacrifice. If taking on c3  hits a Rook on a1, the sacrifice is less viable. There are presumably other subtleties.

  
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