Symmetrically

Playing chess symmetrically involves choosing the starting position of non-pawn pieces by both players starting with black taking turns placing a piece on a square on their back rank, the placement of which the opponent has to mirror on their back rank. The placement of the pieces on the back ranks must be symmetrical, so the A file has the same pieces as the H file on both sides of the board, the B file has the same pieces as the G file on both sides of the board and so on, treating both royal pieces as the same. As an example, black could start by choosing the pieces that go on the C and F files then white could choose the pieces that go on the D and E files then black could choose the pieces that go on the B and G files and then the remaining pieces would go on the A and H files. The sides of short and long castling are determined by which sides the kings are closest to and furthest away from. Bishops have to be on opposite colors and royal pieces have to be between rooks. Black chooses first since choosing first is a slight advantage. Two minutes are allowed for each player to choose a piece. This time limit can of course be different.

An example of a first row starting position when playing chess symmetrically is BRNKQNRB. In this example short castling would be on the A side of the board since that is the side the kings are closest to and long castling would be on the H side of the board since that is the side the kings are furthest away from.