That's not a legal position, since it cannot be reached in a valid game of chess. What do you mean by a piece being in a legal position? A position involves pla

That's not a legal position, since it cannot be reached in a valid game of chess. What do you mean by a piece being in a legal position? A position involves placement of all pieces, as well as turn to move, castling rights, and en-passent capturabililty.