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Queens indian petrosian system
this move order is 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4a3!?
I believe Kasparov likes to use this system. I have been playing 4.. Bb7 as black with no success, and noticed most of the top players play Ba6 white then follows with Qc2 most of the time and often black will bring his Bishop back to b7. But i dont understand why black would play to a6 then back to b7 as all this does is provoke Qc2 which white eventually wants to play???? Can someone help me out here, what do other nimzo/queens indian players play against petrosian surely there are more options than just Ba6 or Bb7?
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4 ...Bb7 or Ba6 is normal development in order to control the centre.
5 Nc3 is the most common reply.
You can also play:
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Qc2 is due to the fact that white cannot push immediately to e4 because of
8.bxc3 Bxe4 and black wins a pawn.
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After 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3, the strategic point of 4... Ba6 is that most of the reasonable ways for White to defend the c-pawn (and to a degree his center in general) entail some drawback. For instance, 5. Qc2 weakens control over the d5-square which can be important if Black decides to play ...c5. After a ...c5 by Black, White would really like to respond d5, but this isn't possible if his queen is on c2 while Black has his bishop on b7 (4... Ba6 5. Qc2 Bb7, intending ...c5, for instance). 4... Ba6 5. e3 is met simply by 5... d5. 5. Nbd2 and then ...Bb7 and Black again has the better control of d5 to play ...d5 or ...c5 as appropriate. And so on.
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i've had a further look at it and i found 4...c5!? is very interesting which leads to a benoni type position (i actually have no idea what the benoni move order actually is) with bishop to g7 and black has good queenside play i think when kasparov plays queens indian he plays c5 to 4a3