Funny move.

[Mogens Larsen]

Geschrieben von: / Posted by: Mogens Larsen at 15 April 2000 12:16:49:
I've been conducting a testmatch between Amy 0.7 and Comet B20 to test and tweak my opening book for Amy. Comet B20 has been a tough opponent so far and leads by 12-10. When I looked at a few of the games, I noticed a funny one. In a clear winning position (mate in two), Comet B20 made a strange move and got checkmated. Probably just a coincidence. The more than dubious move is 59. Nd5??.
[Event "Testmatch: 40 moves in 20 minutes."]
[Site "MOGENS"]
[Date "2000.04.15"]
[Round "22"]
[White "Comet_B20"]
[Black "Amy_07"]
[Result "0-1"]
[ECO "B85"]
[PlyCount "120"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 e6 7. Be2 Be7 8. Be3
Qc7 9. O-O O-O 10. Kh1 Nc6 11. a4 Re8 12. Bf3 Rb8 13. Qd2 Bd7 14. Nb3 b6 15. g4
Bc8 16. g5 Nd7 17. Qf2 Nc5 18. Rfd1 Bd7 19. Bh5 Nxb3 20. cxb3 Na5 21. b4 Nc6
22. b5 Nb4 23. Bd4 a5 24. Rac1 Qa7 25. Qh4 Rec8 26. Bxf7+ Kxf7 27. Qxh7 Rg8 28.
g6+ Kf8 29. Bxg7+ Rxg7 30. Qh8+ Rg8 31. g7+ Kf7 32. Qh5+ Kxg7 33. Rg1+ Bg5 34.
fxg5 Rh8 35. Qd1 d5 36. Qd4+ Kg8 37. Rgf1 Qb7 38. g6 e5 39. Qxe5 Nd3 40. Qd4
dxe4 41. Rf7 Nf2+ 42. Kg2 Bh3+ 43. Kg1 Qxf7 44. gxf7+ Kxf7 45. Qxf2+ Ke8 46.
Qg3 Rc8 47. Qg6+ Kf8 48. Qf6+ Kg8 49. Kh1 Bg2+ 50. Kxg2 Kh7 51. Kh1 Rhg8 52.
Qh4+ Kg7 53. Rg1+ Kf7 54. Qh7+ Ke6 55. Qxe4+ Kd6 56. Rd1+ Kc7 57. Qe5+ Kb7 58.
Rd7+ Ka8 59. Nd5 (59. Qd5+ Rc6 60. Qxc6+ Kb8 61. Qb7#) 59... Rc1+ 60. Qe1 60...
Rxe1# {Black mates} 0-1
Best wishes...
Mogens

Moq

[Gabor Szots]

Geschrieben von: / Posted by: Gabor Szots at 17 April 2000 07:44:31:
Als Antwort auf: / As an answer to: Funny move. geschrieben von: / posted by: Mogens Larsen at 15 April 2000 12:16:49:

I've been conducting a testmatch between Amy 0.7 and Comet B20 to test and tweak my opening book for Amy. Comet B20 has been a tough opponent so far and leads by 12-10. When I looked at a few of the games, I noticed a funny one. In a clear winning position (mate in two), Comet B20 made a strange move and got checkmated. Probably just a coincidence. The more than dubious move is 59. Nd5??.
[Event "Testmatch: 40 moves in 20 minutes."]
[Site "MOGENS"]
[Date "2000.04.15"]
[Round "22"]
[White "Comet_B20"]
[Black "Amy_07"]
[Result "0-1"]
[ECO "B85"]
[PlyCount "120"]
1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 e6 7. Be2 Be7 8. Be3
Qc7 9. O-O O-O 10. Kh1 Nc6 11. a4 Re8 12. Bf3 Rb8 13. Qd2 Bd7 14. Nb3 b6 15. g4
Bc8 16. g5 Nd7 17. Qf2 Nc5 18. Rfd1 Bd7 19. Bh5 Nxb3 20. cxb3 Na5 21. b4 Nc6
22. b5 Nb4 23. Bd4 a5 24. Rac1 Qa7 25. Qh4 Rec8 26. Bxf7+ Kxf7 27. Qxh7 Rg8 28.
g6+ Kf8 29. Bxg7+ Rxg7 30. Qh8+ Rg8 31. g7+ Kf7 32. Qh5+ Kxg7 33. Rg1+ Bg5 34.
fxg5 Rh8 35. Qd1 d5 36. Qd4+ Kg8 37. Rgf1 Qb7 38. g6 e5 39. Qxe5 Nd3 40. Qd4
dxe4 41. Rf7 Nf2+ 42. Kg2 Bh3+ 43. Kg1 Qxf7 44. gxf7+ Kxf7 45. Qxf2+ Ke8 46.
Qg3 Rc8 47. Qg6+ Kf8 48. Qf6+ Kg8 49. Kh1 Bg2+ 50. Kxg2 Kh7 51. Kh1 Rhg8 52.
Qh4+ Kg7 53. Rg1+ Kf7 54. Qh7+ Ke6 55. Qxe4+ Kd6 56. Rd1+ Kc7 57. Qe5+ Kb7 58.
Rd7+ Ka8 59. Nd5 (59. Qd5+ Rc6 60. Qxc6+ Kb8 61. Qb7#) 59... Rc1+ 60. Qe1 60...
Rxe1# {Black mates} 0-1
Best wishes...
Mogens

Hi Mogens,
I checked the position on a Pentium 166, with 5 minutes, then with 1 minute to go. Comet found the mating line with 59. Qd5+ immediately. Perhaps it had only seconds left?
Regards,
Gabor

[Mogens Larsen]

Geschrieben von: / Posted by: Mogens Larsen at 17 April 2000 12:13:45:
Als Antwort auf: / As an answer to: Re: Funny move geschrieben von: / posted by: Gabor Szots at 17 April 2000 07:44:31:

Hi Mogens,
I checked the position on a Pentium 166, with 5 minutes, then with 1 minute to go. Comet found the mating line with 59. Qd5+ immediately. Perhaps it had only seconds left?
Regards,
Gabor

Hey Gabor,
The games were played during the night, so I don't know ). I don't Comet was in time trouble, because it had a winning game for a long time, which reduces time usage. I think it's a freak move caused by the /mg option. There's often a few strange games. Otherwise it could be hashtables or a tablebase probe? I don't think the error is possible to reproduce.
Best wishes...
Mogens

[Gabor Szots]

Geschrieben von: / Posted by: Gabor Szots at 18 April 2000 10:44:46:
Als Antwort auf: / As an answer to: Re: Funny move geschrieben von: / posted by: Mogens Larsen at 17 April 2000 12:13:45:
(snip)
I think it's a freak move caused by the /mg option. There's often a few strange games. Otherwise it could be hashtables or a tablebase probe? I don't think the error is possible to reproduce.
Did you use the /debug option too? That may help (an expert, not me).
Best regards,
Gábor

[Mogens Larsen]

Geschrieben von: / Posted by: Mogens Larsen at 18 April 2000 14:56:01:
Als Antwort auf: / As an answer to: Re: Funny move geschrieben von: / posted by: Gabor Szots at 18 April 2000 10:44:46:

(snip)
I think it's a freak move caused by the /mg option. There's often a few strange games. Otherwise it could be hashtables or a tablebase probe? I don't think the error is possible to reproduce.
Did you use the /debug option too? That may help (an expert, not me).
Best regards,
Gábor

Sadly, I didn't. I don't use it, because I don't see that many obvious mistakes.
Best wishes...
Mogens