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1.d4 a5 2.a3 g5
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1.d4 a5 2.a3 g5 3.c3
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1.d4 a5 2.a3 g5 3.c3 d6
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1.d4 a5 2.a3 g5 3.c3 d6 4.Ng1h3
Bc1xg5
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invalid move: Bc1xg5
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