In the position arising after 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Qb6, I have three things to comment on: A) If black wants to avoid the sharp c4!? variations (where the white player accentuates that Bd7-b5 is a rather time wasting maneuver in the resulting transformed position), he has to take first on d4, as previous posts have already mentioned. Alas, White retakes with the Knight (!), preventing the initial Bb5 idea. Giving up d4 is not a problem, the inclined reader will notice the similarities to the variation 4...Nc6 5.Nf3 Bd7 6.Be2 Qb6, when white has good prospects after taking on c5 (either now or after O-O, not fearing cxd4 cxd4 Nge7 -> f5 because of the standard defensive resource Nc3-a4). A recent high-class encounter in this variation was fought out in Grischuk - Morozevich in the current World Cup tournament. B) After 4...Nc6, the first player usually goes for 5.Nf3 Qb6 6.a3!. Out of this reasoning, the first player is well advised o go for 4...Qb6 5.a3!? As the queen is already on b6, the white player will not get into transposition problems to Bd7 lines, which are considered harmless (i.e. 4..Nc6 5.Nf3 Bd7 6.a3?! (6.Le2) and now either f6 or c4 give black enough play). White achieves two things by this seemingly harmless move, both being connected with the move "won" by not having moved the Ng1 yet. First, White can speed up the counterplay on the c-file, preventing the white square clamp that black often tries to establish. Moreover, the f1-a7 diagonal is not as appealing for the black queen anymore, as white can easily castle following Ng-e2. Finally, black will not be able to overload white's defence of d4 due to the time consuming bishop trade. Hence white does not have to put his knight on f3 anyway. In my opinion, he is good advised to put his knight on the strategically most lucrative square, which is h5. In a recent rapid game played by myself two days ago against a 2350 FM, play continued 4...Qb6 5.a3!? Bd7 6.b4 cxd4 7.cxd4 Bb5 8.Bxb5 Qxb5 9.Nc3 Qd7 (Qc4/c6 stumbles into a swift Rc1, Qb6 lacks the punch as d4 will not get into pressure and grants white a tempo by the means of Na4) 10.Nge2 Ne7 11.Nf4! and the threat of Nh5, putting pressure on the vital dark squares, forced black to continue with 11..g6, which already gives white some weaknesses to play against. After 12.h4!? (Nd3 -> Bg5 is also very interesting) Bg7 13.h5 Nc6 14.O-O O-O-O 15.Bb2 Kb8 16.Nd3! b6 17.a4! Nxd4 18.a5 -> White enjoyed quite an advantage, eventually converting his dangerous initiative into a full point. It should be added that 4...Qb6 5.a3!? c4?!, despite being played twice against me in tournament games by players around 2100, is IMHO an inaccurate move order. With the knight still on g1, white has more freedom on the kingside, and can utilize this in several ways (e.g. an easy f4). C) Sadly, somewhere in this post I forgot the third point I wanted to address. Cheers, Geck0
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