You guys make the same mistake I did. It's not a move by a single piece. Please check out the link in eQ_'s post. It contains the Caro-Kann moves and you can see in the animation that the moves are:
e2-e4
c7-c6
d2-d4
d7-d5
These moves are all made by pawns. It makes a lot of sense since the moves made by other pieces show a shorthand for the kind of piece in the notation:
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Ne5 Bf5 8.c3 g6 9.Qb3 *
Qb3 means that the Queen moves to B3 for instance.
e2-e4
c7-c6
d2-d4
d7-d5
These moves are all made by pawns. It makes a lot of sense since the moves made by other pieces show a shorthand for the kind of piece in the notation:
1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Ne5 Bf5 8.c3 g6 9.Qb3 *
Qb3 means that the Queen moves to B3 for instance.