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Normal Topic Move order question in the exchange Slav. (Read 1589 times)
Markovich
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Re: Move order question in the exchange Slav.
Reply #1 - 01/26/05 at 16:43:29
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After 1.d4 d5 2.c4 c6 3.xd5 xd5 4.Nf3 does black have any good independant variations from the Nf6 main line? If not why does white almost always include Nf3 before exchanging? e6 leading to a semislav or a harmless QGD exchange variation doesn't seem like a possibility that exchange slav players would want to allow.


First, it's not true that White "almost always" includes Nf3 before exchanging.  There are two main ways for White to play the Exchange Slav; (1) with the knight soon on f3 and (2) delayed or never.  The reason for withholding the knight is to avoid Black's ...Bg4 in certain lines.  For example, 3. Nf3 Nf6  4. cxd5 cxd5  5. Nc3 Nc6  6. Bf4 a6  7. e3 Bg4 is considered fully equal (7. Rc1 and 7. Ne5 are two ideas White can use to try for more than equality). 

When the knight is withheld from f3, White sometimes tries ideas like f2-f3, g2-g4, and Nge2-g3 (this is most likely to arise when Black plays ...Bg4 anyway).  Sometimes he just hurries his play on the queenside.  Very often the knight simply comes to f3 after Black has committed is c8 bishop.  To play without the early knight on f3, White probably does best to play 3. cxd5 cxd5  4. Bf4! (4. Nc3 allows the complicating 4...e5).  Black's early ...Qb6 in reply isn't considered too good.  If Black instead tries 3. Nc3, Black can try to mix things up with 3...dxc4.

If White is willing to play the Exchange with the knight early on f3, it is true that after 1. d4 d5  2. c4 c6, the most "precise" way of achieving this is 3. cxd5 cxd5  4. Nf3 and not 3. Nf3.  But White may play 3. Nf3 because he would prefer to play against the Meran (or the Noteboom), and so he invites Black to play 3...e6.   

In any case, White has to have something against the Triangle,  1. d4 d5  2. c4 e6  3. Nc3 (or 3. Nf3) 3...c6, which is how Black often tries to reach the Meran (or Noteboom) while avoiding the exchange Slav.  So particularly if White is a 3. Nf3 player (perhaps he likes the Catalan), he must have something in store for the Triangle, and it hardly hurts to play 3. Nf3 against the Slav.

Somebody in the most recent NIC Yearbook advocates 1. d4 d5  2. c4 c6  3. Nf3 dxc4 as a viable defense, but I have my doubts.

  

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arthur
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Move order question in the exchange Slav.
01/22/05 at 14:11:39
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After 1.d4 d5 2.c4 c6 3.xd5 xd5 4.Nf3 does black have any good independant variations from the Nf6 main line? If not why does white almost always include Nf3 before exchanging? e6 leading to a semislav or a harmless QGD exchange variation doesn't seem like a possibility that exchange slav players would want to allow.
  
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