Board Position

The Bishop's Opening 2.KB-QB4 (move 2w, left) is closely related to the Vienna Game. Seen more in correspondence chess than tournament games, the initial response to the Berlin (eg. 3.P-Q3 move 3w, right) is worth some study as a means of avoiding the Petroff Defence and because several short transpositions into other popular openings are possible (some listed below).

Board Position
The Classical Variation (2..B-B4) can lead to the Lewis Counter or the Jerome (?!) and Petroff gambits, while the Berlin Defence (2..Kt-KB3) includes the Greco, the Ponziani and the Urusov gambits.
Begin Clear or Groups or see move: 1 e4 e5 2 Bc4
(Berlin): 2..Nf6 | 3 d3 c6 4 Nf3 d5 5 exd5 cxd5 6 Bb3 Bb4+ 7 c3 Bd6
| 3 d4 exd4 4 Nf3 Nxe4 5 Qxd4 Nf6 6 Bg5 Be7 7 Nc3 Nc6 8 Qh4 d6 9 0-0-0 Be6
(Class.): 2..Bc5 3 c3 d5 4 Bxd5 Nf6 5 Qf3 0-0 6 d4 exd4 7 Bg5 dxc3 8 Bxf6 c2 9 Nc3 Qxf6 10 Qxf6 gxf6

Transp. into Giuoco Piano
Transp. into Giuoco Pianissimo
Transp. into Modern Bishop's Opg.
Transp. into Vienna (Bishop's Var.)
Transp. into Petroff Opening
Transp. into Evans Gambit