Trivia: What is the proper algebraic notation for the move a4-Rook to the a5-square?

If two identical pieces can move to the same square, the piece that is moved is indicated as follows:

1. 1. If both pieces are on the same rank: by a) the abbreviation of the name of the piece, b) the file of departure, and c) the square of arrival.
2. 2. If both pieces are on the same file: by a) the abbreviation of the name of the piece, b) the rank of the square of departure, and c) the square of arrival.

If the pieces are on different ranks and files, method 1 is preferred.

Examples:

1. There are two knights, on the squares g1 and e1, and one of them moves to the square f3: either Ngf3 or Nef3, as the case may be.
2. There are two knights, on the squares g5 and g1, and one of them moves to the square f3: either N5f3 or N1f3, as the case may be.
3. There are two knights, on the squares h2 and d4, and one of them moves to the square f3: either Nhf3 or Ndf3, as the case may be.
4. If a capture takes place on the square f3, the notation of the previous examples is still applicable, but an x may be inserted: 1) either Ngxf3 or Nexf3, 2) either N5xf3 or N1xf3, 3) either Nhxf3 or Ndxf3, as the case may be.