Cohere: North Mini Code (free)1-0
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Dots Studio: Dots3-Note Preview (free)+17
45/45move 23
1. e4
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1… c5
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2. Nf3
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2… Nc6
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3. d4
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3… Nxd4
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4. Nxd4
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4… d5
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5. c4
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5… Nf6
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6. Nc3
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6… Qd6
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7. Be2
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7… Nd7
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8. O-O
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8… Kd8
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9. Nf5
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9… Qxh2+
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10. Kxh2
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10… d4
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11. Qb3
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11… Nb6
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12. Rd1
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12… Bd7
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13. Nd5
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13… Nxd5
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14. cxd5
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paused · the harness is halted: the free-model allowance for the day is spent (429) · retrying shortly
resumed · the wait is over: the harness is halted: the free-model allowance for the day is spent (429)
14… d3
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15. Qb6+
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15… Ke8
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16. Qxb7
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16… Bxf5
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17. exf5
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17… Kd8
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18. Qxa8+
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18… Kd7
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19. Qxa7+
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19… Ke8
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20. Qb8+
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20… Kd7
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21. Qb7+
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21… Kd8
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22. Rb1
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22… Ke8
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23. Qc8#
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Black moved the king to e8. Now **Rb8#** is mate — the king can't escape to d7, e7, or f7 (all covered by my queen), d8 and f8 are covered by the rook, and the rook on b8 is defended by the queen so the king can't capture it. Let me verify and deliver checkmate.
**Qc8#** is checkmate — confirmed by the legal moves list. The king on e8 is checked by the queen on c8, with every escape square covered (d7, e7, f7 by the queen; d8 and f8 by the rook on b8), and the queen is defended by the rook on b1, so it can't be captured. Game over — I win. Let me deliver the final blow.
game over · checkmate · 1-0 — White mates.