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1.d4 c6 2.e4 g6

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1.d4 c6 2.e4 g6 3.Nc3

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1.d4 c6 2.e4 g6 3.Nc3 Bg7

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1.d4 c6 2.e4 g6 3.Nc3 Bg7 4.f4

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1.d4 c6 2.e4 g6 3.Nc3 Bg7 4.f4 Qb6