Merlin 2.0beta bug

[George Lyapko]

In one of the games from round156 of my blitz tournament Merlin crashed in the game vs. BlackBishop:

[Event "Computer chess game"]
[Site "LYAPKO"]
[Date "2005.03.05"]
[Round "4"]
[White "Merlin 2.0 beta"]
[Black "BlackBishop 0.9.7i"]
[Result "0-1"]
[TimeControl "40/300"]

1. c4 e5 2. d3 Nf6 3. e4 Bc5 4. Nc3 Nc6 5. a3 d6 6. Be2 O-O 7. Bf3 Be6 8.
h4 Nd4 9. Nge2 c6 10. Nxd4 Bxd4 11. Ne2 Qb6 12. O-O d5 13. cxd5 cxd5 14.
Nxd4 Qxd4 15. Re1 dxe4 16. dxe4 Qb6 17. Qe2 Rfc8 18. Rd1 Bb3 19. Rd2 Rc7
20. Qe1 Rc4 21. Rd3 Bc2 22. Re3 Rac8 23. h5 h6 24. Kh1 a6 25. Kh2 Qd4 26.
Be2 R4c7 27. Kg1 Bxe4 28. Rg3 Kh8 29. Rh3 Bd5 30. Rd3 Qh4 31. Bd2 Re7 32.
Rc1 Rcc7 33. Qd1 Rxc1 34. Bxc1 Rc7 35. Be3 Rd7 36. Bc1 Qe4 37. Bf3 Qc4 38.
Be2 Ne4 39. Bg4 Nxf2 40. Kxf2 Bf3 41. gxf3 Rxd3 42. Qe2 Qd4+ 43. Kg2 b5 44.
Bc8 Rd1 45. Be3 Qd3 46. Qxd3 Rxd3 47. Kf2 Rd6 48. Bb7 f5 49. Ke2 Kh7 50.
Bc5 Rf6 51. Bb4 g6 52. Bc3 gxh5 53. Ke3 Kg6 54. Bxe5 Rb6 55. Bc8 Rc6 56.
Bd7 Rc2 57. Bc3 Kg5 58. f4+ Kg4 59. Bc6 h4 60. Bf3+ Kg3 61. Be1+ Kh3 62. b3
Rc1 63. Bd2 Ra1 64. Bc3 Rxa3 65. Bd5 h5 66. Bb2 Ra2 67. Be5 Kg3 68. Bc3 h3
69. Be1+ Kh2 70. Bf2 b4 71. Be6 Kg2 72. Bd5+ Kh2 73. Be6 Rc2 74. Kf3 Rc6
75. Bd5 Rc3+ 76. Ke2 Rc2+ 77. Kf1 Rc1+ 78. Ke2 a5 79. Be6 Rc2+ 80. Kf1 Rc3
81. Ke2 Rc6 82. Bxf5 Rf6 83. Bc8 Rxf4 84. Bb7 Rf5 85. Bc6 Re5+ 86. Kf3 Re6
87. Bd5 Rg6 88. Ba7 Rf6+ 89. Ke2 Kg3 90. Bb8+ Kh4 91. Bc7 Rf5 92. Be6 Rf8
{Merlin crashed} 0-1

If I load final position and try Merlin to play further it always crashes:

Code: Select all

9110 <first : make: Bg4-f3: illegal piece: 0
9110 <first : merlin: board: 5r2/2B5/4B3/p6p/1p5k/1P5p/4K3/ w - a3 0 93
9110 <first : ABNORMAL TERMINATION
Fatal Error: Error: first chess program (merlin_20b) exited unexpectedly


Best regards,
George

[Anonymous]

Dear George,

thank you for reporting, I think I have found the bug and the upcoming release will fix the problem soon.

Bal?zs

[George Lyapko]

Dear George,

thank you for reporting, I think I have found the bug and the upcoming release will fix the problem soon.

Bal?zs

Just before you'll release new version here is another bug - invalid draw claim(black still has a pawn, so you can't claim a draw, you could only offer it):

Game 8: Merlin 2.0 beta-Ldb_20c

1. e4 c5 2. c3 d5 3. d3 Nc6 4. Nd2 Nf6 5. Ngf3 e5 6. a3 Be7 7. b4 a6 8.
Be2 O-O 9. O-O Bg4 10. Qc2 cxb4 11. cxb4 Kh8 12. Re1 Rc8 13. Qb2 Bxf3 14.
Bxf3 dxe4 15. dxe4 Nd4 16. Bd1 Qd6 17. Nb3 Rfd8 18. Nxd4 Qxd4 19. Bb3 Kg8
20. Qa2 Nxe4 21. Bxf7+ Kh8 22. Be3 Qd6 23. Qe6 Qxe6 24. Bxe6 Rc6 25. Bb3
Nc3 26. Bf4 e4 27. Be5 Bf6 28. Bxf6 gxf6 29. f3 f5 30. fxe4 fxe4 31. Re3
Rd3 32. Rxd3 exd3 33. Kf2 d2 34. Ke3 Rd6 35. Bd1 Kg7 36. h4 b6 37. g4 a5
38. g5 Rd7 39. bxa5 bxa5 40. h5 a4 41. Kf2 Rb7 42. Ke3 Rb2 43. Bf3 Rc2 44.
Rh1 Ra2 45. Kd3 Nb5 46. Be4 h6 47. g6 Nxa3 48. Rd1 Nb5 49. Rxd2 Rxd2+ 50.
Kxd2 a3 51. Kc2 Nd4+ 52. Kb1 Ne2 53. Bf3 Nc3+ 54. Kc2 a2 55. Kb2 Kf6 56.
Bg4 Nd5 57. Kxa2 Nf4 58. Kb3 Nxg6 59. hxg6 Kxg6 60. Kc4

Result :0-1 { neither side has enough material to mate:win awarded to black(wrong claim by white)}
Warning level :4
Final position: 8/8/6kp/8/2K3B1/8/8/8 b - - 1 60
Analyze result:0-1 {awarded??}

Best regards,
George

[Anonymous]

Hi George,

this bug was removed also (I hope), but thank you very much,

Balazs

Dear George,

thank you for reporting, I think I have found the bug and the upcoming release will fix the problem soon.

Bal?zs

Just before you'll release new version here is another bug - invalid draw claim(black still has a pawn, so you can't claim a draw, you could only offer it):

Game 8: Merlin 2.0 beta-Ldb_20c

1. e4 c5 2. c3 d5 3. d3 Nc6 4. Nd2 Nf6 5. Ngf3 e5 6. a3 Be7 7. b4 a6 8.
Be2 O-O 9. O-O Bg4 10. Qc2 cxb4 11. cxb4 Kh8 12. Re1 Rc8 13. Qb2 Bxf3 14.
Bxf3 dxe4 15. dxe4 Nd4 16. Bd1 Qd6 17. Nb3 Rfd8 18. Nxd4 Qxd4 19. Bb3 Kg8
20. Qa2 Nxe4 21. Bxf7+ Kh8 22. Be3 Qd6 23. Qe6 Qxe6 24. Bxe6 Rc6 25. Bb3
Nc3 26. Bf4 e4 27. Be5 Bf6 28. Bxf6 gxf6 29. f3 f5 30. fxe4 fxe4 31. Re3
Rd3 32. Rxd3 exd3 33. Kf2 d2 34. Ke3 Rd6 35. Bd1 Kg7 36. h4 b6 37. g4 a5
38. g5 Rd7 39. bxa5 bxa5 40. h5 a4 41. Kf2 Rb7 42. Ke3 Rb2 43. Bf3 Rc2 44.
Rh1 Ra2 45. Kd3 Nb5 46. Be4 h6 47. g6 Nxa3 48. Rd1 Nb5 49. Rxd2 Rxd2+ 50.
Kxd2 a3 51. Kc2 Nd4+ 52. Kb1 Ne2 53. Bf3 Nc3+ 54. Kc2 a2 55. Kb2 Kf6 56.
Bg4 Nd5 57. Kxa2 Nf4 58. Kb3 Nxg6 59. hxg6 Kxg6 60. Kc4

Result :0-1 { neither side has enough material to mate:win awarded to black(wrong claim by white)}
Warning level :4
Final position: 8/8/6kp/8/2K3B1/8/8/8 b - - 1 60
Analyze result:0-1 {awarded??}

Best regards,
George