Bug: Illegal move (castling out of check)

[rwbc]

Hi I am watching the evolution of Megalodon :)

My compilation from just an hour ago shows a severe bug. (WIN7-64) From the game below you can see that Megalodon tries to castle out of check after Bb5+.

(Game was played in a CuteChessGUI dev compilation - alweys' EXPER1 branch)

[Event "My Tournament"]
[Site "RWBC-CAPPUCCINO Win7U64 Q8200 2.33Ghz + Nvidia GT 710"]
[Date "2021.03.19"]
[Round "1"]
[White "Monchester_099-64"]
[Black "Megalodon_021dev-64"]
[Result "1-0"]
[ECO "A05"]
[GameDuration "00:00:34"]
[GameEndTime "2021-03-19T09:31:28.286 Mitteleuropäische Zeit"]
[GameStartTime "2021-03-19T09:30:53.487 Mitteleuropäische Zeit"]
[Opening "Reti Opening"]
[PlyCount "29"]
[Termination "illegal move"]
[TimeControl "120+1"]

1. Nf3 {book} Nf6 {book} 2. d4 {book} e6 {book} 3. Bf4 {book} d6 {book}
4. Bg5 {+2.14/4 0.24s} h6 {-0.92/4 3.98s} 5. Bxf6 {+1.22/4 0.23s}
Qxf6 {-0.60/4 5.85s} 6. Nc3 {+1.22/4 0.19s} Nc6 {-1.12/4 2.92s}
7. Qc1 {+1.22/4 0.27s} Nxd4 {-0.36/4 2.27s} 8. Ne4 {+0.28/4 0.34s}
Nxf3+ {-0.92/4 4.51s} 9. gxf3 {+0.22/4 0.025s} Qe5 {-0.70/4 2.17s}
10. Ng3 {+0.22/4 0.27s} d5 {+0.32/4 2.33s} 11. Kd1 {+0.22/4 0.28s}
Qd4+ {+1.05/4 1.37s} 12. Ke1 {-8.54/4 0.023s} Bc5 {+0.99/4 2.33s}
13. e3 {+0.22/4 0.33s} Qf6 {+0.88/4 2.18s} 14. Kd2 {+0.22/4 0.32s}
Qxf3 {+2.12/4 1.16s} 15. Bb5+ {-9.54/4 0.40s, Black makes an illegal move: e8g8}
1-0

Edit:

Here is another illegal move, moving a Bishop, which is pinned to its King by an opponent Rook

[Event "My Tournament"]
[Site "RWBC-CAPPUCCINO Win7U64 Q8200 2.33Ghz + Nvidia GT 710"]
[Date "2021.03.19"]
[Round "2"]
[White "Monchester_099-64"]
[Black "Megalodon_021dev-64"]
[Result "1-0"]
[ECO "A05"]
[GameDuration "00:00:51"]
[GameEndTime "2021-03-19T09:33:32.848 Mitteleuropäische Zeit"]
[GameStartTime "2021-03-19T09:32:41.382 Mitteleuropäische Zeit"]
[Opening "Reti Opening"]
[PlyCount "83"]
[Termination "illegal move"]
[TimeControl "120+1"]

1. Nf3 {book} Nf6 {book} 2. b3 {book} g6 {book} 3. Bb2 {book} Bg7 {book}
4. Bxf6 {+1.28/4 0.15s} Bxf6 {-0.07/4 1.48s} 5. d4 {+1.28/4 0.097s}
O-O {+0.16/4 0.32s} 6. Nc3 {+1.28/4 0.11s} Nc6 {+0.01/4 1.28s}
7. e3 {+1.28/4 0.16s} Rb8 {+0.06/4 2.87s} 8. Bb5 {+1.34/4 0.22s}
a6 {0.00/4 3.34s} 9. Bxc6 {+3.11/4 0.27s} bxc6 {-0.29/4 1.98s}
10. Rb1 {+3.11/4 0.20s} Re8 {-0.29/4 1.61s} 11. Rb2 {+3.11/4 0.19s}
Kh8 {-0.17/4 1.30s} 12. Qd2 {+3.11/4 0.19s} Rb7 {-0.03/4 1.49s}
13. O-O {+3.11/4 0.16s} e6 {-0.92/4 1.84s} 14. Re1 {+3.11/4 0.19s}
h5 {-1.10/4 2.43s} 15. Re2 {+3.11/4 0.19s} Re7 {-1.33/4 1.80s}
16. Kf1 {+3.11/4 0.13s} Bg7 {-1.07/4 1.60s} 17. Ke1 {+3.11/4 0.14s}
c5 {-0.59/4 1.34s} 18. Kd1 {+3.11/4 0.14s} c4 {-0.05/4 0.64s}
19. e4 {+3.11/4 0.15s} f6 {-0.17/4 0.71s} 20. a3 {+3.11/4 0.16s}
a5 {-0.08/4 0.47s} 21. Kc1 {+3.11/4 0.17s} cxb3 {-0.38/4 0.68s}
22. Rxb3 {+4.11/4 0.17s} Rxb3 {-0.38/4 3.40s} 23. cxb3 {+3.11/4 0.19s}
Ba6 {-0.02/4 1.53s} 24. Re1 {+3.11/4 0.23s} Qb8 {-0.09/4 2.52s}
25. Kc2 {+3.11/4 0.39s} c6 {-0.03/4 1.57s} 26. Rd1 {+3.11/4 0.50s}
g5 {+0.03/4 2.10s} 27. h3 {+3.11/4 0.46s} g4 {+0.18/4 0.96s}
28. hxg4 {+4.11/4 0.50s} hxg4 {+0.53/4 0.94s} 29. Rh1+ {+3.00/4 0.40s}
Kg8 {+2.88/3 0.023s} 30. Ne1 {+3.00/4 0.65s} Qd6 {+2.30/3 0.15s}
31. Nb1 {+3.85/4 0.33s} e5 {+2.48/3 0.26s} 32. Qxa5 {+4.85/4 0.25s}
c5 {+1.40/3 0.20s} 33. Qd8+ {+4.85/4 0.26s} Bf8 {+1.51/3 0.044s}
34. Rh4 {+4.85/4 0.25s} f5 {+1.65/3 0.19s} 35. dxe5 {+3.94/4 0.30s}
Qxe5 {+2.46/3 0.21s} 36. Qa8 {+3.85/4 0.30s} Qxe4+ {+2.93/3 0.23s}
37. Qxe4 {-5.71/4 0.073s} Rxe4 {+4.73/3 0.11s} 38. Nc3 {-5.71/4 0.11s}
Rxe1 {+4.54/3 0.069s} 39. Rh5 {-5.71/4 0.14s} Bg7 {+4.54/3 0.099s}
40. Rxf5 {-6.54/4 0.19s} Bb7 {+4.15/3 0.21s} 41. Rg5 {-5.71/4 0.22s}
Re8 {+4.45/3 0.12s} 42. Kd1 {-4.71/4 0.17s, Black makes an illegal move: g7c3}
1-0

Guenther

[ArjunSahlot]

Thanks for following Megalodon! We have recently fixed the castling out of check bug. And our team is currently working on fixing the pin bug. Thanks!

[phuang1024]

For future reference, this is the string of UCI moves for the pin bug.

position startpos moves g1f3 g8f6 b2b3 g7g6 c1b2 f8g7 b2f6 g7f6 d2d4 e8g8 b1c3 b8c6 e2e3 a8b8 f1b5 a7a6 b5c6 b7c6 a1b1 f8e8 b1b2 g8h8 d1d2 b8b7 e1g1 e7e6 f1e1 h7h5 e1e2 e8e7 g1f1 f6g7 f1e1 c6c5 e1d1 c5c4 e3e4 f7f6 a2a3 a6a5 d1c1 c4b3 b2b3 b7b3 c2b3 c8a6 e2e1 d8b8 c1c2 c7c6 e1d1 g6g5 h2h3 g5g4 h3g4 h5g4 d1h1 h8g8 f3e1 b8d6 c3b1 e6e5 d2a5 c6c5 a5d8 g7f8 h1h4 f6f5 d4e5 d6e5 d8a8 e5e4 a8e4 e7e4 b1c3 e4e1 h4h5 f8g7 h5f5 a6b7 f5g5 e1e8 c2d1

[ArjunSahlot]

The pin bug has successfully been fixed.