Chess checkmate detection bug.

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Score: +1

1. ajackpot,

Hello?
In the match below, the game ends with a checkmate even though there is no checkmate situation.
Please check.

[Event "Online game on QCPlayroom"]
[Site "http://qcsalon.net/"]
[Date 2021.10.21"]
[Round "1"]
[White "Flash gordon"]
[Black "ajackpot"]
[WhiteType "PROGRAM"]
[BlackType "HUMAN"]
[Result "*"]

1. Pe2-e4. Pc7-c5
2. Ng1-e2. Ng8-f6
3. Pd2-d4. Nf6xe4
4. Pd4-d5. Pg7-g6
5. Ph2-h4. Ph7-h5
6. Nb1-d2. Ne4-f6
7. Pd5-d6. Pe7xd6
8. Nd2-c4. Pd6-d5
9. Ne2-c3. Pd5xc4
10. Bc1-g5. Bf8-e7
11. Bg5xf6. Be7xf6
12. Qd1-e2+. Ke8-f8
13. Ke1-c1. Bf6xc3
14. Pb2xc3. Nb8-c6
15. Rd1-d6. Pb7-b5
16. Pa2-a4. Pb5xa4
17. Qe2-e3. Bc8-a6
18. Pg2-g3. Qd8-e7
19. Qe3xc5. Ra8-b8
20. Bf1-h3. Rb8-b5
21. Qc5-a3. Nc6-e5
22. Pf2-f4. Ne5-f3
23. Bh3-g2. Qe7-e3+
24. Rd6-d2+. Kf8-g7
25. Bg2xf3. Qe3xf3
26. Rh1-d1. Rh8-b8
27. Qa3-a1. Qf3-e3
28. Pf4-f5. Pa4-a3
29. Pf5-f6+. Kg7-h7
30. Rd1-f1. Rb5-b1+

Score: +1

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