perhaps a very nice test postion for programmers. I am sure that such a bug is in a lot of engines.
First TalkChess report about a Patt-Bug
Now let us look in the position ...
Junior 11.1a played 61. ... Rxd1
Very easy Ktulu 9.0x played 62. Qxg6 and the game ended with patt.
Interesting is that Junior show the mate moves before
SWCR Game:
Code: Select all
[Event "ktulu-903"]
[Site "Trier-Feyen"]
[Date "2010.03.23"]
[Round "2.1"]
[White "Ktulu 9"]
[Black "Junior 11.1a"]
[Result "1/2-1/2"]
[ECO "A26"]
[Annotator "0.26;0.48"]
[PlyCount "124"]
[EventDate "2010.03.23"]
[EventType "simul"]
[Source "Quisinsky"]
[TimeControl "40/600:40/600:40/600"]
{Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz 3000 MHz W=14.9 plies; 2.
291kN/s; Strong-2010.ctg B=17.6 plies; 2.295kN/s; Strong-2010.ctg} 1. c4 {
[%eval 0,0] [%emt 0:00:00]} e5 {[%eval 0,0] [%emt 0:00:00]} 2. Nc3 {[%eval 0,0]
[%emt 0:00:00]} Nc6 {[%eval 0,0] [%emt 0:00:00]} 3. g3 {[%eval 0,0] [%emt 0:00:
00]} g6 {[%eval 0,0] [%emt 0:00:00]} 4. Rb1 {[%eval 0,0] [%emt 0:00:00]} a5 {
[%eval 0,0] [%emt 0:00:00]} 5. a3 {[%eval 0,0] [%emt 0:00:00]} f5 {[%eval 0,0]
[%emt 0:00:00]} 6. d3 {[%eval 1,0] [%emt 0:00:00]} Nf6 {[%eval 48,14] [%emt 0:
00:11]} 7. Nf3 {[%eval 26,14] [%emt 0:00:13] (Bg2)} Bg7 {[%eval 48,15] [%emt 0:
00:19] (d6)} 8. Bg2 {[%eval 24,16] [%emt 0:00:47]} d6 {[%eval 0,0] [%emt 0:00:
00]} 9. O-O {[%eval 0,0] [%emt 0:00:00]} O-O {[%eval 0,0] [%emt 0:00:00]} 10.
b4 {[%eval 0,0] [%emt 0:00:00]} axb4 {[%eval 0,0] [%emt 0:00:00]} 11. axb4 {
[%eval 0,0] [%emt 0:00:00]} h6 {[%eval 0,0] [%emt 0:00:00]} 12. b5 {[%eval 0,0]
[%emt 0:00:00]} Ne7 {[%eval 0,0] [%emt 0:00:00]} 13. Qb3 {[%eval 0,0] [%emt 0:
00:00]} Be6 {[%eval 32,16] [%emt 0:00:14]} 14. Bb2 {[%eval 14,13] [%emt 0:00:
10] (Qb2)} Nd7 {[%eval 47,17] [%emt 0:00:27]} 15. Ra1 {[%eval 20,16] [%emt 0:
00:31]} Nc5 {[%eval 42,17] [%emt 0:00:00]} 16. Qc2 {[%eval 19,15] [%emt 0:00:
14]} f4 {[%eval 43,16] [%emt 0:00:01] (Qd7)} 17. Rxa8 {[%eval 37,14] [%emt 0:
00:25] (gxf4)} Qxa8 {[%eval 38,15] [%emt 0:00:08]} 18. Ra1 {[%eval 42,15]
[%emt 0:00:50] (gxf4)} Qe8 {[%eval 53,17] [%emt 0:00:16] (Qc8)} 19. Nd2 {
[%eval 42,14] [%emt 0:00:24] (gxf4)} Qf7 {[%eval 64,15] [%emt 0:00:29] (Nf5)}
20. Nce4 {[%eval 38,14] [%emt 0:00:14]} Nxe4 {[%eval 60,17] [%emt 0:00:06] (b6)
} 21. Nxe4 {[%eval 42,15] [%emt 0:00:19]} Bf5 {[%eval 85,19] [%emt 0:00:48]
(Nf5)} 22. gxf4 {[%eval 55,12] [%emt 0:00:09]} Bxe4 {[%eval 86,17] [%emt 0:00:
15] (exf4)} 23. Bxe4 {[%eval 63,14] [%emt 0:00:10] (dxe4)} Qxf4 {[%eval 46,16]
[%emt 0:00:16]} 24. e3 {[%eval 51,14] [%emt 0:00:04]} Qg5+ {[%eval 43,17]
[%emt 0:00:16] (Qg4+)} 25. Kh1 {[%eval 67,15] [%emt 0:00:17] (Bg2)} Qh4 {
[%eval 45,17] [%emt 0:00:14] (Qf6)} 26. f3 {[%eval 68,14] [%emt 0:00:14] (Rf1)}
c6 {[%eval 48,17] [%emt 0:00:41] (Qg5)} 27. Ba3 {[%eval 73,13] [%emt 0:00:15]}
Nf5 {[%eval 44,16] [%emt 0:00:04]} 28. Rg1 {[%eval 84,13] [%emt 0:00:12] (Qg2)}
Kh7 {[%eval 36,15] [%emt 0:00:16]} 29. Qa4 {[%eval 68,14] [%emt 0:00:08]} cxb5
{[%eval 26,16] [%emt 0:00:14]} 30. Qxb5 {[%eval 95,16] [%emt 0:00:07]} Qf2 {
[%eval 32,18] [%emt 0:00:12]} 31. Qxb7 {[%eval 90,16] [%emt 0:00:14] (Qd5)}
Qxe3 {[%eval 41,19] [%emt 0:00:23]} 32. Qb2 {[%eval 93,17] [%emt 0:00:36] (c5)}
Rf6 {[%eval 47,18] [%emt 0:00:22]} 33. Qg2 {[%eval 99,17] [%emt 0:00:14]} Qa7 {
[%eval 65,18] [%emt 0:00:13] (Ne7)} 34. Bb4 {[%eval 100,16] [%emt 0:00:25]
(Bxf5)} Qf7 {[%eval 25,18] [%emt 0:00:21]} 35. Be1 {[%eval 87,17] [%emt 0:00:
08]} Qe6 {[%eval 31,18] [%emt 0:00:12] (Ne3)} 36. Bf2 {[%eval 93,16] [%emt 0:
00:19]} Rf8 {[%eval 49,19] [%emt 0:00:11]} 37. Rb1 {[%eval 99,17] [%emt 0:00:
17]} Rd8 {[%eval 58,20] [%emt 0:01:10] (Bf6)} 38. Rb6 {[%eval 102,16] [%emt 0:
00:24]} Qf7 {[%eval 67,18] [%emt 0:00:13]} 39. Qg4 {[%eval 101,16] [%emt 0:00:
14] (Bd5)} h5 {[%eval 46,17] [%emt 0:00:37]} 40. Qg2 {[%eval 97,16] [%emt 0:00:
01] (Qg1)} Bh6 {[%eval 25,18] [%emt 0:00:33] (Bf6)} 41. Qg1 {[%eval 84,14]
[%emt 0:00:10] (Bd5)} Bf4 {[%eval 27,17] [%emt 0:00:18] (Rd7)} 42. Ra6 {[%eval
75,16] [%emt 0:00:17] (d4)} Kh6 {[%eval 21,17] [%emt 0:00:14] (Rd7)} 43. Qb1 {
[%eval 79,14] [%emt 0:00:17]} Bg5 {[%eval 18,15] [%emt 0:00:00]} 44. Qb6 {
[%eval 78,14] [%emt 0:00:17] (Qe1)} h4 {[%eval 20,16] [%emt 0:00:14] (Qf8)} 45.
Kg2 {[%eval 89,13] [%emt 0:00:10] (Ra7)} Qf6 {[%eval 0,14] [%emt 0:00:11] (Kh5)
} 46. Ra7 {[%eval 64,12] [%emt 0:00:11] (c5)} Rf8 {[%eval 18,16] [%emt 0:00:26]
(Bf4)} 47. Ra1 {[%eval 51,12] [%emt 0:00:11] (h3)} Bc1 {[%eval -2,17] [%emt 0:
00:16] (Bf4)} 48. Kh3 {[%eval 18,13] [%emt 0:00:09]} Qg5 {[%eval 17,16] [%emt
0:00:03]} 49. c5 {[%eval 8,14] [%emt 0:00:10] (Qb1)} Qd2 {[%eval -177,16]
[%emt 0:00:12] (Ne3)} 50. Bg1 {[%eval -104,13] [%emt 0:00:12] (cxd6)} Qe2 {
[%eval -614,16] [%emt 0:00:17] (d5)} 51. Ra2 {[%eval -534,13] [%emt 0:00:11]}
Qxa2 {[%eval -614,14] [%emt 0:00:00]} 52. cxd6 {[%eval -710,13] [%emt 0:00:20]}
Bg5 {[%eval -661,17] [%emt 0:00:00] (Nd4)} 53. Qf2 {[%eval -728,14] [%emt 0:00:
11]} Qe6 {[%eval -693,18] [%emt 0:00:17]} 54. Kg2 {[%eval -850,16] [%emt 0:00:
22]} h3+ {[%eval -724,18] [%emt 0:00:00] (Nxd6)} 55. Kh1 {[%eval -920,16]
[%emt 0:00:25]} Nxd6 {[%eval -745,21] [%emt 0:00:00]} 56. Bc6 {[%eval -1095,16]
[%emt 0:00:18] (Qg3)} Rc8 {[%eval -813,17] [%emt 0:00:07]} 57. Ba4 {[%eval
-1361,16] [%emt 0:00:07]} Rc1 {[%eval -1453,20] [%emt 0:00:13]} 58. Bc2 {
[%eval -32747,16] [%emt 0:01:02]} Nf5 {[%eval -2116,19] [%emt 0:00:08]} 59. Qe2
{[%eval -32749,15] [%emt 0:00:08]} Nd4 {[%eval -32755,22] [%emt 0:00:12] (Be3)}
60. Qe4 {[%eval -32747,13] [%emt 0:00:39]} Qd5 {[%eval -32757,27] [%emt 0:00:
00] (Qb6)} 61. Bd1 {[%eval -32755,15] [%emt 0:00:10] (f4)} Rxd1 {[%eval -32759,
27] [%emt 0:00:17] (Qxe4)} 62. Qxg6+ {[%eval 0,25] [%emt 0:00:12] (Qg4)} Kxg6 {
[%eval -86,7] [%emt 0:00:00]} 1/2-1/2
Best
Frank
At the moment I check Ktulu games, now I found this one. OK, switched to Junior beta testing ...