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1.e4 g6 2.d4 f5
exf5
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1.e4 g6 2.d4 f5 3.exf5
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gxf5
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1.e4 g6 2.d4 f5 3.exf5 gxf5
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1.e4 g6 2.d4 f5 3.exf5 gxf5 4.Nc3