Undefined pieces: Orthodox pieces or pawns of undisclosed nature and color. The solution must satisfy both stipulated parts, i.e. the PG and the mate.
Annanchess: If two pieces of the same side are standing close to each other in N-S-direction, the front piece moves only like the rear piece as long as the contact exists. The front piece is that piece that is nearer to the own promotion rank. The rear piece transfers only his kind of moving, but no characters like magic, paralyzing, royal, ability to promote etc. Pawns may enter the rank of their own officers; there they cannot move, but still give their power to a front piece. Officers, making a douple step with the power of a Pawn, cannot be captured en-passant; Pawns can only be captured en-passant, when they make a double step with the power of a Pawn, but not if they make a double step with the power of another piece (e.g. Rook or Queen). Officers with the power of a Pawn may capture en-passant. If three or more pieces are in orthogonal contact, each piece moves only like the piece that is directly behind. Example: wPe2, wRe3, wBe4; wPe2 moves like a wPe2, wRe3 moves like a wPe3, wBe4 moves like a wRe4.
No.1355