After 4...dxc4 5.Bg2 a6 6.0-0 Nc6 with 7.e3 Rb8 8.Nfd2 e5 9.Bxc6 a double-edged position is on the board!
Catalan <strong>1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 dxc4 5.Bg2 a6 6.0-0 Nc6</strong>
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