Underpromotion Problems

[Norm Pollock]

Geschrieben von:/Posted by: Norm Pollock at 14 April 2004 17:41:59:

Which engines cannot handle underpromotions?
In this game Tao/Yin 5.6 freezes up when SOS4 uses underpromotion to get a commanding advantage. Tao lost on time.
[Event "Tourney"]
[Site "NORM2"]
[Date "2004.04.14"]
[Round "5.4"]
[Number "24"]
[White "tao/yin"]
[Black "sos4"]
[Result "0-1"]
[TimeControl "180+1"]
1. d4 d5 2. Nc3 e6 3. Nf3 Nf6 4. Bg5 h6 5. Bxf6 Qxf6 6. e4 Bb4 7. Bd3 dxe4
8. Bxe4 c5 9. Qd3 O-O 10. O-O cxd4 11. Nb5 Nc6 12. Nbxd4 Nxd4 13. Nxd4 Rd8
14. c3 Bc5 15. Qc2 Bxd4 16. cxd4 Qxd4 17. Rad1 Qb6 18. Rxd8+ Qxd8 19. Rd1
Qe7 20. f4 Rb8 21. Qd3 f5 22. Bf3 Kf7 23. Kh1 b6 24. Qb5 Qc7 25. Qa4 a6 26.
Bh5+ g6 27. Bf3 Qe7 28. Bc6 g5 29. a3 Qc7 30. Be8+ Kg8 31. fxg5 hxg5 32.
Qb3 Qe7 33. Bc6 b5 34. Qe3 b4 35. a4 e5 36. Rc1 Kg7 37. Bd5 f4 38. Qe2 Qd6
39. Bc4 g4 40. Rd1 Qf6 41. Qf2 f3 42. Bd5 fxg2+ 43. Qxg2 Bf5 44. Bc4 Rc8
45. Qb7+ Kh6 46. Qxb4 Be4+ 47. Kg1 Qf4 48. Qb6+ Kh5 49. Rf1 Bf3 50. Bd3 Rc6
51. Qa7 g3 52. Qh7+ Kg5 53. Qe7+ Kg4 54. Qg7+ Kh4 55. Qh8+ Rh6 56. Qd8+ Kh3
57. Qd7+ Bg4 58. Rxf4 gxh2+ 59. Kf2 h1=N+
{Black wins on time} 0-1

[Günther Simon]

Geschrieben von:/Posted by: Günther Simon at 14 April 2004 17:47:44:
Als Antwort auf:/In reply to: Underpromotion Problems geschrieben von:/posted by: Norm Pollock at 14 April 2004 17:41:59:

Which engines cannot handle underpromotions?
In this game Tao/Yin 5.6 freezes up when SOS4 uses underpromotion to get a commanding advantage. Tao lost on time.
[Event "Tourney"]
[Site "NORM2"]
[Date "2004.04.14"]
[Round "5.4"]
[Number "24"]
[White "tao/yin"]
[Black "sos4"]
[Result "0-1"]
[TimeControl "180+1"]
1. d4 d5 2. Nc3 e6 3. Nf3 Nf6 4. Bg5 h6 5. Bxf6 Qxf6 6. e4 Bb4 7. Bd3 dxe4
8. Bxe4 c5 9. Qd3 O-O 10. O-O cxd4 11. Nb5 Nc6 12. Nbxd4 Nxd4 13. Nxd4 Rd8
14. c3 Bc5 15. Qc2 Bxd4 16. cxd4 Qxd4 17. Rad1 Qb6 18. Rxd8+ Qxd8 19. Rd1
Qe7 20. f4 Rb8 21. Qd3 f5 22. Bf3 Kf7 23. Kh1 b6 24. Qb5 Qc7 25. Qa4 a6 26.
Bh5+ g6 27. Bf3 Qe7 28. Bc6 g5 29. a3 Qc7 30. Be8+ Kg8 31. fxg5 hxg5 32.
Qb3 Qe7 33. Bc6 b5 34. Qe3 b4 35. a4 e5 36. Rc1 Kg7 37. Bd5 f4 38. Qe2 Qd6
39. Bc4 g4 40. Rd1 Qf6 41. Qf2 f3 42. Bd5 fxg2+ 43. Qxg2 Bf5 44. Bc4 Rc8
45. Qb7+ Kh6 46. Qxb4 Be4+ 47. Kg1 Qf4 48. Qb6+ Kh5 49. Rf1 Bf3 50. Bd3 Rc6
51. Qa7 g3 52. Qh7+ Kg5 53. Qe7+ Kg4 54. Qg7+ Kh4 55. Qh8+ Rh6 56. Qd8+ Kh3
57. Qd7+ Bg4 58. Rxf4 gxh2+ 59. Kf2 h1=N+
{Black wins on time} 0-1

This is just a 'historical' bug in Tao, which doesn't know
about underpromotions.(AFAIK Bas doesn't care about it, as its
probability to appear is so low)
Regards,
Günther

[Robert Allgeuer]

Geschrieben von:/Posted by: Robert Allgeuer at 14 April 2004 20:14:43:
Als Antwort auf:/In reply to: Re: Underpromotion Problems geschrieben von:/posted by: Günther Simon at 14 April 2004 17:47:44:

Which engines cannot handle underpromotions?
In this game Tao/Yin 5.6 freezes up when SOS4 uses underpromotion to get a commanding advantage. Tao lost on time.
[Event "Tourney"]
[Site "NORM2"]
[Date "2004.04.14"]
[Round "5.4"]
[Number "24"]
[White "tao/yin"]
[Black "sos4"]
[Result "0-1"]
[TimeControl "180+1"]
1. d4 d5 2. Nc3 e6 3. Nf3 Nf6 4. Bg5 h6 5. Bxf6 Qxf6 6. e4 Bb4 7. Bd3 dxe4
8. Bxe4 c5 9. Qd3 O-O 10. O-O cxd4 11. Nb5 Nc6 12. Nbxd4 Nxd4 13. Nxd4 Rd8
14. c3 Bc5 15. Qc2 Bxd4 16. cxd4 Qxd4 17. Rad1 Qb6 18. Rxd8+ Qxd8 19. Rd1
Qe7 20. f4 Rb8 21. Qd3 f5 22. Bf3 Kf7 23. Kh1 b6 24. Qb5 Qc7 25. Qa4 a6 26.
Bh5+ g6 27. Bf3 Qe7 28. Bc6 g5 29. a3 Qc7 30. Be8+ Kg8 31. fxg5 hxg5 32.
Qb3 Qe7 33. Bc6 b5 34. Qe3 b4 35. a4 e5 36. Rc1 Kg7 37. Bd5 f4 38. Qe2 Qd6
39. Bc4 g4 40. Rd1 Qf6 41. Qf2 f3 42. Bd5 fxg2+ 43. Qxg2 Bf5 44. Bc4 Rc8
45. Qb7+ Kh6 46. Qxb4 Be4+ 47. Kg1 Qf4 48. Qb6+ Kh5 49. Rf1 Bf3 50. Bd3 Rc6
51. Qa7 g3 52. Qh7+ Kg5 53. Qe7+ Kg4 54. Qg7+ Kh4 55. Qh8+ Rh6 56. Qd8+ Kh3
57. Qd7+ Bg4 58. Rxf4 gxh2+ 59. Kf2 h1=N+
{Black wins on time} 0-1

This is just a 'historical' bug in Tao, which doesn't know
about underpromotions.(AFAIK Bas doesn't care about it, as its
probability to appear is so low)
Regards,
Günther

In about 800 games with Tao this problem occured if I remember right 4 times, so less than in half percent of the games. Still it is a bit frustrating, Tao has just now lost here against Leila due to this problem....
Robert