1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6
... dxc6 5. O-O
... dxc6 5. Nc3
... dxc6 5. d4 exd4 6. Qxd4 Qxd4 7. Nxd4 Bd7
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