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Subject: Re: Perpetual check/repetition test position

Author: Richard Pijl

Date: 02:26:43 01/24/03

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On January 23, 2003 at 18:49:23, Dieter Buerssner wrote:

>I cannot find the tread anymore - but such positions were requested recently
>here. I just was watching this game between Tiger and Yace.
>
>[D] 1rrq2k1/5ppp/Rb1p1n2/4pP2/R3P1P1/1NNQ3P/1PP5/7K b - - 0 26
>
>After Nxg4!, black had a draw. In the end position of the game, black was down 2
>rooks.

It takes the Baron quite some time (on P3-500) to find this move:

 ply       time     nodes  score  pv

  4( 6)&      0     10334    -35  c8c7 g4g5 f6h5 c3d5
  4( 6).      0     12198    -35  c8c7 g4g5 f6h5 c3d5
  5( 7)&      0     16433    -50  c8c7 g4g5 f6h5 c3d5 d8g5
  5( 7)&      0     24704    -42  d8e7 g4g5 f6d7 f5f6 g7f6 g5f6
  5( 7)&      0     34790    -27  d8d7 a4b4 d7d8 c3a4 b6f2
  5(11).      0     71420    -27  g8h8 a4c4 c8c4 d3c4 d8e7 c3d5
  6(11)&      1    118406    -42  g8h8 a4a1 f6e8 c3e2 e8f6 g4g5
  6(11)&      1    135800    -37  d8d7 g4g5 f6h5 c3d5 b6f2 h3h4
  6(11)&      2    161000    -30  b8b7 g4g5 f6h5 d3d5 h5g3 h1g2 d8g5
  6(13).      3    245210    -30  b8b7 g4g5 f6h5 d3d5 h5g3 h1g2 d8g5
  7(15)&      5    435099    -45  b8b7 a4b4 f6d7 c3d5 d8h4 d5b6 d7b6
  7(15)&      7    548240    -44  g8h8 a4c4 c8c4 d3c4 b8b7 c4c6 b6e3 c6b7
  7(15)&      9    686096    -32  c8c7 c3e2 g8h8 g4g5 f6h5 a4b4 d8g5
  7(15).     12    957128    -32  c8c7 c3e2 g8h8 g4g5 f6h5 a4b4 d8g5
  8(17)&     23   1769326    -28  c8c7 a4b4 c7d7 c3a4 b6f2 b4b8 d8b8 g4g5 b8c8
  8(18).     35   2624383    -28  c8c7 a4b4 c7d7 c3a4 b6f2 b4b8 d8b8 g4g5 b8c8
  9(19)&     43   3222495    -56  c8c7 a4b4 c7b7 c3a4 f6d7 a4b6 d7b6 b3a5 b7e7
h1g2
  9(19)&     89   6728979    -42  d8c7 a4b4 h7h6 c3a4 b6c5 b4b8 c8b8 a4c5 d6c5
d3c4 b8d8
  9(20).    169  12548945    -42  d8c7 a4b4 h7h6 c3a4 b6c5 b4b8 c8b8 a4c5 d6c5
d3c4 b8d8
 10(21)&    249  18577746    -44  d8c7 a4b4 h7h6 c3a4 b6c5 b4b8 c8b8 a4c5 d6c5
d3c4 c7e7
 10(21)&    474  34612490    -32  c8c7 a4b4 c7b7 b4b5 d8e7 g4g5 f6d7 c3d5 e7g5
d5b6
 10(22).    563  40931404    -32  c8c7 a4b4 c7b7 b4b5 d8e7 g4g5 f6d7
 11(22)&    841  61042917    -44  c8c7 a4b4 c7b7 h1g2 h7h5 c3a4 h5g4 h3g4 f6g4
a4b6 b7b6 a6b6
 11(23)&   1243  89901111    -43  g8h8 h1g2 d8c7 g2f1 h7h6 a4b4 b8b7 c3d5 f6d5
d3d5 c7c2
 11(24)&   2461 175881838    -28  b8b7 d3d2 h7h6 a4b4 c8b8 c3a4 b6e3 b4b7 e3d2
b7b8
 11(24)&   2807 200068192      0  f6g4 h3g4 d8h4 h1g2 c8c3 b2c3 h4g4 g2f1 g4g1
f1e2 g1f2 e2d1 b6e3 b3c1 e3c1
 11(24).   2904 206899982      0  f6g4 h3g4 d8h4 h1g2 c8c3 b2c3 h4g4 g2f1 g4g1
f1e2 g1f2 e2d1 b6e3 b3c1 e3c1
 12(25)&   3267 232739470      0  f6g4 h3g4 c8c3 b2c3 d8h4 h1g2 h4g4 g2f1 g4f4
f1e2 f4f2 e2d1 f2g1 d1d2 b6f2 d3d6 g1e1

Richard.
>
>
>[Event "ICC 15 3"]
>[Site "Internet Chess Club"]
>[Date "2003.01.23"]
>[Round "-"]
>[White "ajop"]
>[Black "Yace"]
>[WhiteElo "2677"]
>[BlackElo "2627"]
>[ECO "B92"]
>[Result "1/2-1/2"]
>
>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2
>e5 7. Nb3 Be7 8. O-O O-O 9. a4 Be6 10. f4 Qc7 11. Kh1 Nbd7
>12. f5 Bc4 13. a5 Rfc8 14. Bxc4 Qxc4 15. Ra4 Qc6 16. Qd3
>Bd8 17. Be3 b5 18. axb6 Bxb6 19. Bg5 Bd8 20. Bxf6 Nxf6
>21. Rfa1 Bb6 22. h3 Rab8 23. Rxa6 Qd7 24. R1a2 Qc7 25. R2a4
>Qd8 26. g4 Nxg4 27. hxg4 Qh4+ 28. Kg2 Rxc3 29. bxc3 Qxg4+
>30. Kf1 Qg1+ 31. Ke2 Qf2+ 32. Kd1 Be3 33. Nd2 Rb1+ 34. Nxb1
>Qg1+ 35. Ke2 Qf2+ 36. Kd1 Qg1+ 37. Ke2 Qf2+ 38. Kd1 {Game
>drawn by repetition} 1/2-1/2



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