Author: Ferdinand S. Mosca
Date: 07:52:43 05/22/01
Go up one level in this thread
On May 22, 2001 at 07:18:23, Jarkko Pesonen wrote:
>[D] 7k/pB6/8/2P1p1p1/1P6/P7/5r1P/7K b - -
>
>Is this position lost for Black if
>it doesn't choose Kg7 or Kg8 to get
>Kd6 as soon as possible ?
>
>Any comments?
I agree this is not a very easy ending for a program, especially if the time
control is short (but your time to me is already reasonable), but I guess Black
can win this position by Rc2 with a correct follow up, but Rc2 alone does not
gaurantee a win, see my analysis inserted on the game score below. I think Yace
knows well this type of position, if you have time try to reverse the color.
>
>Yace - Crafty ended in this position.
>Both tought that Black was in better position
>and wanted to play 30. .. Ra2 or 30. .. Rc2
>Black lost in the end.
>
>(Intel 350MHz)
>Crafty
>14 3:02 -0.81 1. ... Ra2 2. c6 Rc2 3. Kg1 e4 4. Kf1
> e3 5. Ke1 Kg7 6. Kd1 e2+ 7. Ke1 Kf6
> 8. Ba6 Ke5 9. Bxe2 Rxc6
>yace
>19649046 1:34.9 0.61 14u. 1...Rc2 2.c6 e4 3.Kg1 Kg7 4.b5 e3 5.Kf1 Kf6
> 6.Ke1 Ke5 7.h3 {HT} {70}
>
>[Event "Computer chess game"]
>[Site ""]
>[Date "2001.05.22"]
>[Round "-"]
>[White "Yace 0.99.01"]
>[Black "wcrafty"]
>[Result "1-0"]
>[TimeControl "1200+10"]
>[FEN "r1bqnrk1/ppp1npbp/3p2p1/3Pp3/2P1P3/2N1B3/PP2BPPP/R2QNRK1 b - - 0 1"]
>[SetUp "1"]
>
>{--------------
>r . b q n r k .
>p p p . n p b p
>. . . p . . p .
>. . . P p . . .
>. . P . P . . .
>. . N . B . . .
>P P . . B P P P
>R . . Q N R K .
>black to play
>--------------}
>1... f5 2. Nf3 Nf6 3. Ng5 h6 4. Nf3 Nxe4 5. Nxe4 fxe4 6. Nd2 Nf5 7. Nxe4
>Qh4 8. Bf3 Nxe3 9. fxe3 Bf5 10. g3 Qe7 11. Kh1 Rf7 12. Qe2 Raf8 13. b4 Qd7
>14. a3 Bh3 15. Rf2 Bf5 16. Rff1 Kh8 17. c5 Bh3 18. Rf2 c6 19. Rg1 cxd5 20.
>Nxd6 Rf6 21. e4 g5 22. g4 h5 23. Nf5 dxe4 24. Bxe4 Bxg4 25. Rxg4 hxg4 26.
>Qxg4 Bh6 27. Nxh6 Qxg4 28. Nxg4 Rxf2 29. Nxf2 Rxf2 30. Bxb7
[I have not viewed this on the board, but perhaps it is on this point, the
diagram you have referred.]
>30... Ra2
[Better is 30...Rc2 31. c6 Kg7!! 32. b5 Kf6! 33. a4 Ke7 34. a5 Kd6 35.b6 axb6
36. axb6 Rxc6!! and black wins. This is the point of Rc2, but along this line
there are a lot of traps for black.]
>31. c6 Rc2
>32. Kg1 e4 33. b5 e3 34. Kf1 Rf2+ 35. Ke1 Rc2 36. a4 Kg7 37. a5 Kf6 38. b6
>axb6 39. a6 Rc1+ 40. Ke2 Ke5 41. a7 Ra1 42. c7 Rxa7 43. c8=Q Ra2+ 44. Kxe3
>Ra3+ 45. Ke2 Ra2+ 46. Kf3 Ra3+ 47. Kg4 Ra5 48. Qc7+ Kd4 49. Qxb6+ Kd3 50.
>Qxa5 Kc2 51. h4 Kd3 52. hxg5 Kc2
>{Black resigns} 1-0
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