It's chess moves where 1.e4 is the first move: (king) pawn from e2 to e4 and 1.d4 is (queen) pawn from d2 to d4
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It's chess moves where 1.e4 is the first move: (king) pawn from e2 to e4 and 1.d4 is (queen) pawn from d2 to d4