Line 240 deals with one of the critical variations of the Open Defense (4… dxc4) of the Catalan. By giving a check, Black wants to disturb White’s development. White’s usual choice is 6. Bd2, and now 6… a5 is considered to be the best option for Black.
If White decides to attack the c4-pawn immediately with 7. Qc2, Black should try to protect the pawn as long as possible, i.e. 7… Bxd2+ 8. Nbxd2 b5 9. a4 c6, or 8. Qxd2 c6 9. a4 Ne4 10. Qc2 Nd6. White has full compensation for the pawn, but probably not much more than that.
[Diagram: Black to Move] Black Rook on d3 is under attack and he can not move it because his Knight is hanging. However, White’s pieces lack coordination and Black has the means to launch a strong attack. What should he do?
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