1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4
5. O-O O-O 6. d3
5. O-O O-O 6. Nd5 Nxd5 7. exd5 e4
5. O-O O-O 6. Bxc6
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