In case of 6. e3, Black usually replies with 6… h6 7. Bh4 g5 8. Bg3 Ne4. Black’s kingside gets a bit weakened, but White remains with doubled c-pawns when Black plays Bxc3. For example, 9. Qc2 Bxc3+ 10. bxc3 d6 11. Bd3 f5, with mutual play.
Black may play a similar plan even after 6. Qc2. For example 6… h6 7. Bh4 g5 8. Bg3 Ne4 9. Nd2 Bxc3 10. bxc3 Nxg3 11. hxg3 Qe7, often followed by d7-d6, Nd7 and O-O-O.
[Diagram: White to Move] If Black manages to castle long, he would get a satisfactory position. How should White continue to seize the initiative?
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