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3.c3 c5 4.Nf3 / e3 / dxc5 / d5

4.Nf3 d5 5.e3 / dxc5 Nbd2 / Be3

4.dxc5 Na6 5.e4 / b4 / Be3

4.d5 Qb6 5.Bc1 / Qc2

3.c3 c5 4.e3 - cxd4 / Qb6

4.e3 Qb6 5.Nd2 / Qb3

4.Be3 Qb6 5.Qc1 / Qc2 / Qb3 / b3