level 13 is possible
1. Nf3 Nf6 2. Ne5 Ng4 3. Ng6 Ne5 4. Nxh8 Ng6 5. Nxg6 Nc6 6. Nf4 Nb8 7. Nh3 Nc6 8. Nc3 Na5 9. Nd5 Nc6 10. Nb6 Nb4 11. Nxa8 Nc6 12. Nb6 Nb4 13. Ng1 Nd5 14. Nc4 Nc3 15. Na3 Nb1 16. Nxb1
qewrc
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