All pieces start out with the potential to be any piece.
Rules Rules of orthodox chess apply except as follows. Whenever a piece is captured, the owning player must state which actual piece was captured. If a piece that is potentially a pawn, makes a pawn move to the last rank, the moving player must decide at that point whether to reduce the piece to a pawn and promote it, or reduce the piece to a non-pawn. Pawns or potential pawns on the 1st rank may make an initial two-square move. A potential pawn piece may be captured en passant.