Hi,

i just witnessed another game with the ponder bug. At move 55 rybka 2.3.1 with white ponders that black would play Rxf3?? expecting to be 5.xx up after winning the rook for nothing. Of course the opponent played a normal move and the game continued to a draw. The second game is from another thread and shows the same bug where rybka 2.3.1 with white at move 22 ponders a totally insane move. It expects  that black will play Qa5?? loosing a queen! the opponent played a normal move and the game continued as if nothing happened. There seems to be something wrong with rybka extracting the pondermove of the previous best line. Maybe something to do with the moves being capture moves?

[Event "Wertungspartie, 5m + 0s"]
[Site "Maschinenraum"]
[Date "2007.03.07"]
[Round "?"]
[White "Constanza,  Rybka 2.3.1 mp 32-b"]
[Black "Pioner"]
[Result "1/2-1/2"]
[ECO "D23"]
[WhiteElo "2705"]
[BlackElo "2633"]
[Annotator "-0.07;-0.15"]
[PlyCount "121"]
[EventDate "2007.03.07"]
[TimeControl "300"]

{HIARCS 11.1 MP UCI: 13.2 ply; 744kN/s AMD Athlon(tm) 64 X2 Dual Core
Processor 3800+ 2800MHz, (2 threads), top2.ctg,} 1. d4 {B/0 0} c6 {B/0 0} 2. c4
{B/0 0} d5 {B/0 0} 3. Nf3 {B/0 0} Nf6 {B/0 0} 4. Qb3 {B/0 0} dxc4 {-0.01/1 0}
5. Qxc4 {B/0 0} Bf5 {-0.01/1 0} 6. g3 {B/0 0} e6 {-0.01/1 0} 7. Nc3 {B/0 0}
Nbd7 {B/0 0} 8. Bg2 {B/0 0} Be7 {B/0 0} 9. O-O {B/0 0} O-O {B/0 0} 10. e3 {
B/0 0} Ne4 {B/0 0} 11. Qe2 {B/0 0} Nxc3 {B/0 0} 12. bxc3 {B/0 0} Be4 {B/0 0}
13. c4 {B/0 0} Qa5 {B/0 0} 14. Nd2 {B/0 0} Bxg2 {-0.15/13 11} 15. Kxg2 {B/0 0}
e5 {-0.17/12 11} 16. Bb2 {B/0 0} exd4 {-0.21/12 10} 17. exd4 {(Êb3) B/0 0} Rfe8
{-0.29/13 10} 18. Qd3 {B/0 0} b5 {-0.36/13 9} 19. Bc3 {-0.07/12 12} Qa4 {
(Qa3) -0.51/13 0} 20. Rfe1 {(Ëfb1) 0.00/13 15} Nb6 {(Rad8) -0.49/12 10} 21.
cxb5 {-0.02/14 32} cxb5 {-0.40/14 0} 22. Nf3 {(d5) -0.02/13 7} Qa3 {
(Rad8) -0.60/12 6} 23. Rab1 {(Êe5) -0.04/13 3} b4 {-0.53/13 12} 24. Rb3 {
0.00/16 5} Qa4 {-0.53/13 0} 25. Bd2 {-0.10/14 8} Nd5 {(Rac8) -0.37/12 0} 26.
Ne5 {0.13/13 7} Red8 {(Rac8) -0.37/12 6} 27. Rc1 {0.19/12 14} a5 {-0.31/13 0}
28. Rb2 {0.15/12 4} Bf6 {-0.18/12 0} 29. Qe4 {(f4) 0.11/14 29} Bxe5 {
(Qe8) -0.03/12 16} 30. dxe5 {0.23/14 4} Qe8 {(Qd7) 0.00/13 4} 31. Rbc2 {
(f3) 0.15/13 14} Qe6 {0.00/12 5} 32. Bg5 {(f3) 0.22/15 5} Re8 {-0.21/13 8} 33.
Rc6 {0.15/16 3} Qxe5 {-0.18/14 0} 34. Qxe5 {0.08/17 7} Rxe5 {0.02/17 0} 35.
Rc8+ {0.05/16 0} Re8 {0.05/15 0} 36. Rxe8+ {0.12/18 7} Rxe8 {0.05/18 0} 37. Rc5
{0.19/17 7} f6 {(Nc3) 0.10/17 0} 38. Rxd5 {0.14/14 1} fxg5 {0.17/16 2} 39. Rxa5
{0.11/17 1} h6 {(g4) 0.17/15 5} 40. Ra4 {(h3) 0.05/16 4} Re2 {0.12/15 5} 41.
Kf3 {(Ëxb4) 0.00/18 5} Rb2 {(Rc2) 0.11/15 7} 42. Ra7 {0.01/17 3} Kh7 {0.11/15 0
} 43. Ra6 {0.00/16 1} h5 {(Kg8) 0.10/15 5} 44. h3 {0.05/14 3} g6 {
(Rc2) 0.09/15 7} 45. Ra7+ {0.00/17 3} Kh6 {0.09/15 0} 46. Ra4 {(Ëa8) 0.00/18 2}
b3 {(Kg7) 0.04/15 6} 47. axb3 {0.00/16 0} Rxb3+ {(Rxf2+) 0.03/14 1} 48. Ke4 {
(Êðg2) 0.00/19 3} h4 {(Rb2) -0.21/14 8} 49. gxh4 {0.00/17 1} gxh4 {-0.07/13 3}
50. f3 {0.00/20 2} Kh5 {(Kg5) 0.00/12 0} 51. Rd4 {(Ëa5+) 0.00/19 3} Ra3 {
(Kg5) -0.03/13 6} 52. Rd5+ {(Ëd8) 0.00/18 2} Kh6 {(g5) 0.00/14 5} 53. Rd1 {
(Ëd4) 0.00/21 3} Rb3 {(Kg5) 0.00/14 5} 54. Kf4 {(Ëd8) 0.00/20 3} g5+ {
(Rb4+) -0.01/13 5} 55. Ke4 {0.00/15 1} Rb6 {(Rxf3) 0.00/14 3} 56. Ke5 {
(Ëd4) 0.00/16 2} Kg6 {(Rb8) -0.07/13 6} 57. Rd4 {(Ëd8) -0.08/15 3} Rf6 {
-0.28/13 4} 58. Rd3 {-0.14/19 4} Rf5+ {-0.25/15 0} 59. Ke4 {-0.14/20 3} Rf4+ {
-0.25/15 0} 60. Ke3 {(Êðe5) -0.14/15 1} Rb4 {(Rf6) -0.26/13 4} 61. Ra3 {
(Ëd4)  (Lag: Av=0.57s, max=5.8s) 0.00/19 2} 1/2-1/2

In the following game rybka 2.3.1 with white on move 22 ponders a totally insane move that black will play Qa5?? hanging a queen - seeing itself with +5. Black obvioulsy does not hang its queen and the came continues normally....

[Event "Wertungspartie, 5m + 0s"]
[Site "Maschinenraum"]
[Date "2007.03.05"]
[Round "?"]
[White "Casshern 2200"]
[Black "Morula, Rybka 2.2 mp."]
[Result "1-0"]
[ECO "B00"]
[WhiteElo "1921"]
[BlackElo "2691"]
[Annotator "0.49;0.34"]
[PlyCount "109"]
[EventDate "2007.03.06"]
[TimeControl "300"]

{Rybka 2.2 mp.: 17.3 ply; 293kN/s Intel(R) Core(TM)2 CPU          6600  @ 2.
40GHz 2404MHz, (2 threads), top2.ctg,} 1. d4 {B/0 0} h6 {B/0 0} 2. e4 {B/0 0}
d6 {B/0 0} 3. Nc3 {B/0 0} g5 {0.34/13 10} 4. Bc4 {(f4) B/0 0} Nc6 {0.34/14 14}
5. h4 {0.49/13 12} g4 {0.32/15 4} 6. Nge2 {0.53/14 5} Bg7 {(Nf6) 0.30/15 36} 7.
Be3 {(0-0) B/0 0} Nf6 {0.38/15 46} 8. Ng3 {0.46/13 13} Bd7 {(a6) 0.36/15 8} 9.
O-O {0.54/13 11} a6 {(e6) 0.38/14 0} 10. a4 {0.56/13 26} e6 {0.38/15 0} 11. Re1
{0.54/13 10} O-O {(Qe7) 0.39/14 14} 12. h5 {0.68/11 10} e5 {0.42/15 0} 13. d5 {
0.75/14 9} Nd4 {0.47/16 0} 14. Qd2 {0.75/13 13} Rc8 {0.49/15 0} 15. Nce2 {
(Ted1) 0.69/13 13} c5 {0.47/14 7} 16. a5 {(dxc6) 0.69/13 2} Kh7 {0.44/13 11}
17. c3 {0.68/13 1} Ne8 {(Qe7) 0.43/13 5} 18. Qd3 {0.75/12 8} Qc7 {0.47/15 0}
19. Bd2 {0.80/13 5} Nxe2+ {0.48/14 3} 20. Qxe2 {0.75/14 25} Bf6 {0.45/16 0} 21.
f4 {0.75/13 7} gxf3 {(Ng7) 0.33/16 0} 22. Qxf3 {0.68/11 0} Qd8 {
(Qxa5) 0.39/16 5} 23. Nf5 {0.51/12 6} Bg5 {0.37/15 0} 24. Bxg5 {
(Tad1) 0.46/14 6} Qxg5 {0.34/14 1} 25. Rf1 {0.50/12 0} Rg8 {(Bxf5) 0.31/14 2}
26. Be2 {0.46/13 5} Rc7 {(Bxf5) 0.32/15 0} 27. Rad1 {(Tf2) 0.37/13 7} f6 {
0.19/13 3} 28. b3 {(Tb1) 0.34/13 2} Bxf5 {0.19/14 1} 29. Qxf5+ {0.30/14 2} Qxf5
{0.14/17 0} 30. Rxf5 {0.29/16 1} Rcg7 {(Rg3) 0.13/18 2} 31. g4 {0.34/15 6}
Rxg4+ {(b6) 0.23/20 0} 32. Bxg4 {0.35/14 0} Rxg4+ {0.20/17 0} 33. Kf2 {
0.51/16 1} Rxe4 {0.19/17 0} 34. Rb1 {0.58/17 3} Rg4 {(Rh4) 0.32/18 0} 35. b4 {
0.62/17 4} cxb4 {0.38/18 1} 36. Rxb4 {0.59/17 0} Rxb4 {0.58/20 3} 37. cxb4 {
0.78/22 2} Kg7 {0.54/22 0} 38. Rf3 {0.73/21 4} Nc7 {0.77/21 2} 39. Rg3+ {
1.01/18 2} Kf7 {0.83/21 1} 40. Rg6 {1.07/18 0} Nxd5 {0.87/19 1} 41. Rxh6 {
1.52/18 1} Kg7 {(Kg8) 0.97/18 1} 42. Rg6+ {1.61/16 1} Kh8 {0.96/20 3} 43. h6 {
(b5) 1.59/19 2} Nxb4 {1.06/20 3} 44. Rxf6 {2.56/19 4} Nc6 {(d5) 1.86/20 6} 45.
Kf3 {(Txd6) 2.56/17 2} d5 {(Nxa5) 2.15/18 4} 46. Kg4 {2.94/19 2} e4 {2.76/19 0}
47. Kg5 {(Te6) 4.19/19 1} Kg8 {(e3) 3.69/21 3} 48. Kh5 {(Te6) 4.84/18 2} e3 {
(d4) 4.00/17 3} 49. Re6 {5.23/19 6} Kh7 {5.58/20 0} 50. Rxe3 {5.45/16 0} d4 {
5.77/19 2} 51. Re6 {5.64/17 3} d3 {#21/21 9} 52. Rd6 {6.50/18 1} Ne5 {
14.50/18 0} 53. Rd5 {6.50/16 1} d2 {(Nc6) #18/18 0} 54. Rxd2 {6.69/13 1} Kg8 {
#17/16 0} 55. Rd8+ {
(Td5) Morula,Rybka 2.2 mp. gibt auf  (Lag: Av=0.22s, max=0.6s) 7.31/17 1} 1-0