Author: Joachim Rang
Date: 11:49:28 04/17/04
Go up one level in this thread
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
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