Bishop's opening (C23)
e4 e5 Bc4
e4 e5 Bc4
| Bishop's opening Berlin defence (C24) Nf6 | Bc5 Bishop's opening Classical variation (C23) |
| Bishop's opening Calabrese counter-gambit (C23) f5 | Nf6 Bishop's opening Berlin defence (C24) |
| Bishop's opening Classical variation (C23) Bc5 | c6 Bishop's opening Philidor counter-attack (C23) |
| Bishop's opening Philidor counter-attack (C23) c6 | f5 Bishop's opening Calabrese counter-gambit (C23) |