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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3
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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3 h6
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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3 h6 5.g3
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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3 h6 5.g3 e5
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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3 h6 5.g3 e5 6.dxe5
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invalid move d4e5: <nil>
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no pawn found that can move to e5
d4xe5
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invalid move d4xe5: <nil>