1. Main line 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Choose a line 1. Main line 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 2. Keidansky Gambit 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nxe4 5. Qxd4 Close 1. Main line 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 2. Keidansky Gambit 1. e4 e5 2. Bc4 Nf6 3. d4 exd4 4. Nf3 Nxe4 5. Qxd4 Next