Author: Sam Lloyd
Date: 14:28:34 04/17/04
Go up one level in this thread
On April 17, 2004 at 14:49:28, Joachim Rang wrote:
>On April 17, 2004 at 13:59:37, Kurt Utzinger wrote:
>
>>On April 17, 2004 at 12:49:13, Ed Schröder wrote:
>>
>>>On April 17, 2004 at 04:21:08, Kurt Utzinger wrote:
>>>
>>>>[D]8/7R/2rk1p2/4bR2/1p1pK3/6P1/1P5P/8 w - - 0 49
>>>
>>>>Hiarcs9 vs List 5.13 (Position after 48...Kd6)
>>>>White has of course a won position: the question however
>>>>is which program finds the easiest way with 49.Rxe5
>>>>and transposition to a won pawn end game?
>>>
>>>49.Rxe5 is tense, it requires a lot of chess knowledge to play. For instance put
>>>the pawns b2 and b4 on a2 and a4 and 49.Rxe5 is a draw. Good test position for
>>>programs that find 49.Rxe5
>>>
>>>Ed
>>>
>>>=======
>>
>> Hi Ed
>> You are right I think: 49.Rxe5 requires a lot of chess
>> knowledge, but it's possible to implement this knowledge.
>> Fritz 8.0.0.26 needs 0 seconds for this move:
>>
>>New game
>>8/7R/2rk1p2/4bR2/1p1pK3/6P1/1P5P/8 w - - 0 1
>>
>>Analysis by Fritz 8: (P4 1.8/32 MB hash)
>>
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.b3 Kd7 53.g4 Ke6 54.g5 Kf7
>> +- (2.31) Depth: 7/16 00:00:00 42kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.b3 Kd7 53.g4 Ke6 54.g5 Kf7
>> +- (2.31) Depth: 8/16 00:00:00 70kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.b3 Kd7 53.g4 Ke6 54.g5 Kf7
>> +- (2.31) Depth: 9/18 00:00:00 171kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.b3 Kd7 53.g4 Ke6 54.h3 Kf6
>> +- (2.43) Depth: 10/25 00:00:00 397kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.b3 Kd7 53.g4 Ke6 54.h3
>> +- (2.43) Depth: 11/23 00:00:01 836kN
>>49.Rxe5!
>> +- (2.72) Depth: 12/25 00:00:03 1647kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.h4 Kd7 53.g4 Ke7 54.g5 b3 55.h5 Ke6
>>56.h6
>> +- (2.62) Depth: 13/25 00:00:07 4038kN
>>49.Rxe5!
>> +- (2.90) Depth: 14/35 00:00:16 9965kN
>>49.Rxe5!
>> +- (3.18) Depth: 14/35 00:00:16 10186kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.h4 Kd7 53.g4 Ke7 54.g5 Kf8 55.h5 Kg8
>>56.Kd3 Kf7 57.b3 Ke7
>> +- (3.34) Depth: 14/35 00:00:17 10637kN
>>49.Rxe5--
>> +- (3.06) Depth: 15/35 00:00:33 21640kN
>>49.Rxe5 fxe5 50.Rh6+
>> +- (3.06) Depth: 15/36 00:00:34 22532kN
>>49.Rxe5!
>> +- (3.34) Depth: 16/34 00:02:01 82801kN
>>49.Rxe5 fxe5 50.Rh6+ Kd7 51.Rxc6 Kxc6 52.h4 Kd6 53.g4 Ke6 54.g5 Kf7 55.h5 Ke7
>>56.Kd3 Kf7
>> +- (3.37) Depth: 16/34 00:02:05 84966kN
>>49.Rxe5--
>> +- (3.09) Depth: 17/32 00:04:29 186602kN, tb=1
>>49.Rxe5 fxe5 50.Rh6+
>> +- (3.09) Depth: 17/48 00:04:38 193261kN, tb=1
>>
>>(Utzinger, MyTown 17.04.2004)
>>
>>
>>>
>>>>[Event "RK 2004 Ath 1.3/64 90m+30s"]
>>>>[Site "Zurich"]
>>>>[Date "2004.04.03"]
>>>>[Round "8.7"]
>>>>[White "Hiarcs 9"]
>>>>[Black "List 513"]
>>>>[Result "1-0"]
>>>>[ECO "D46"]
>>>>[PlyCount "111"]
>>>>
>>>>1. Nf3 Nf6 2. d4 d5 3. c4 c6 4. Nc3 e6 5. e3 Nbd7 6. Qc2 Bd6 7. Bd3 O-O 8. O-O
>>>>dxc4 9. Bxc4 b5 10. Be2 Bb7 11. Rd1 Qc7 12. e4 e5 13. g3 Rfe8 14. a3 a6 15.
>>>>dxe5 Nxe5 16. Bg5 Nxf3+ 17. Bxf3 {Both last book move} Qe7 18. Bg2 h6 19. Bxf6
>>>>Qxf6 20. f4 Qg6 21. Rd3 Rad8 22. Rad1 Bc7 23. Nd5 Rxd5 24. exd5 Bb6+ 25. Kh1
>>>>cxd5 26. R3d2 Qxc2 27. Rxc2 Rd8 28. f5 Rd7 29. Rcd2 d4 30. Bxb7 Rxb7 31. Rc2 a5
>>>>32. Re1 Kh7 33. Re5 Rd7 34. Rd2 b4 35. axb4 axb4 36. Rb5 Rd6 37. Rd3 g6 38. Kg2
>>>>gxf5 39. Rxf5 Kg6 40. Rb5 Kf6 41. Kf3 Ke6 42. Ke4 Rc6 43. Rf3 Bc5 44. Rb8 f6
>>>>45. Rh8 Bd6 46. Rxh6 Be5 47. Rf5 Kd7 48. Rh7+ Kd6 49. Rxe5 fxe5 50. Rh6+ Kd7
>>>>51. Rxc6 Kxc6 52. h4 Kd6 53. g4 b3 54. g5 Ke6 55. h5 Kf7 56. Kd3 1-0
>
>
>it seems, that Fritz 8 has no knowledge but speculation about such positions.
>
>That's the analysis with the pawns an a2 and a4:
>
>New game
>8/7R/2rk1p2/4bR2/p2pK3/6P1/P6P/8 w - - 0 1
>
>Analysis by Fritz 8:
>
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d6 5.a2-a3 Kd6-c5
>6.h2-h4
> +- (2.12) Depth: 7/16 00:00:00 47kN
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d6 5.a2-a3 Kd6-c5
>6.h2-h4
> +- (2.12) Depth: 8/18 00:00:00 70kN
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d6 5.a2-a3 Kd6-c5
>6.h2-h4
> +- (2.12) Depth: 9/19 00:00:00 164kN
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d6 5.h2-h3 Kd6-e6
>6.h3-h4 Ke6-f6 7.a2-a3 Kf6-g6 8.Ke4-d3 Kg6-f6
> +- (2.22) Depth: 10/33 00:00:00 346kN
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d7 5.a2-a3 Kd7-e6
>6.h2-h3 Ke6-f7
> +- (2.15) Depth: 11/26 00:00:01 798kN
>1.Rf5xe5--
> +- (1.87) Depth: 12/28 00:00:03 1956kN
>1.Rf5xe5 f6xe5 2.Rh7-h6+ Kd6-d7 3.Rh6xc6 Kd7xc6 4.g3-g4 Kc6-d7 5.h2-h4 Kd7-e6
>6.h4-h5 Ke6-f6 7.Ke4-f3 Kf6-e6 8.a2-a3 Ke6-e7
> ± (1.40) Depth: 12/33 00:00:03 2199kN
>1.Rf5-f2!
> +- (1.43) Depth: 12/33 00:00:13 9092kN
>1.Rf5-f2 Rc6-c3 2.Rh7-a7 a4-a3 3.g3-g4 Rc3-h3 4.Ke4-f5 Be5xh2 5.Ra7-a6+ Kd6-d5
>6.Ra6xf6 Bh2-e5 7.Rf6-f7
> +- (1.56) Depth: 12/33 00:00:14 9878kN
>1.Rf5-f3!
> +- (1.59) Depth: 12/33 00:00:18 12768kN
>1.Rf5-f3!
> +- (1.75) Depth: 12/33 00:00:20 13981kN
>1.Rf5-f3 Kd6-e6 2.Rh7-a7 Rc6-c2 3.Ra7xa4 Rc2-e2+ 4.Ke4-d3 Re2xh2 5.Ra4-a6+
>Ke6-d5 6.Rf3-f5 Rh2-h3 7.Ra6xf6 Rh3xg3+ 8.Rf5-f3 Rg3-g2 9.Rf3-f2 Rg2-g3+
> +- (1.72) Depth: 13/35 00:00:31 21360kN
>1.Rf5-f3 Kd6-e6 2.Rh7-a7 Rc6-c2 3.Ra7-a6+ Ke6-f7 4.Ra6xa4 Rc2xh2 5.Ra4-a7+
>Kf7-e6 6.Ra7-a6+
> +- (1.75) Depth: 14/32 00:00:55 37792kN
>
>So Fritz speculates first that the pawn-endgame will be won and only via search
>relizes that this is not the case.
>
>regards Joachim
Interesting, as a human would look at Rxe5 and only if it's wrong would the
human reject it.
This seems to be the case for Fritz 8 as well. I think that is a leap foward in
CC.
Terry
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