Author: Dieter Buerssner
Date: 06:56:14 01/05/02
Go up one level in this thread
On January 04, 2002 at 22:42:26, Dan Andersson wrote:
>[D]1R6/6pK/5p2/4p3/1B1p3n/8/p1p1pp2/1k3b2 w - - 0 1
>Krabbé (1985)
>
>I have posted it before.
I tried this with Yace, running in the background with 20M hash:
55962675 5:52.0 0.00 15. 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Ba3+ {-480}
92238734 9:44.2 Mat38 16++ 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Bxd4+ Kc1 4. Be3+
Kd1 5. Rd8+ Ke1 6. Bd2+ Kd1 7. Bb4+ Kc1 8. Ba3+
Kb1 9. Rb8+ Ka1 10. Bb2+ Kb1 11. Bxe5+ Kc1 12.
Bf4+ Kd1 13. Rd8+ Ke1 14. Bd2+ Kd1 15. Bb4+ Kc1
16. Ba3+ Kb1 17. Rb8+ Ka1 18. Bb2+ Kb1 19.
Bxf6+ Kc1 20. Bg5+ Kd1H 21. Rd8+H Ke1H 22.
Bd2+H Kd1H 23. Bb4+H Kc1H 24. Ba3+H Kb1H 25.
Rb8+H Ka1H 26. Bb2+H Kb1H 27. Bxg7+H Kc1H 28.
Bh6+H Kd1H 29. Rd8+H Ke1H 30. Bd2+H Kd1H 31.
Bb4+H Kc1H 32. Ba3+H Kb1H 33. Rb8+H Ka1H 34.
Be7H c1=QH 35. Bf6+H Qb2H 36. Rxb2H e1=QH {HT}
{-1001}
But it lost the mate again later. This was also not unsurprising, because Yace
has by default a maximum ply of 62, which is not enough here. So, the mate can
only be found with support (and luck) from the hash tables.
Out of curiosity, I made 2 very small changes: Doubling the maximum ply and also
limiting check extension less:
10040485 1:25.2 Mat38 11++ 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Bxd4+ Kc1 4. Be3+
Kd1 5. Rd8+ Ke1 6. Bd2+ Kd1 7. Bb4+ Kc1 8. Ba3+
Kb1 9. Rb8+ Ka1 10. Bb2+ Kb1 11. Bxe5+ Kc1 12.
Bf4+ Kd1 13. Rd8+ Ke1 14. Bd2+ Kd1 15. Bb4+ Kc1
16. Ba3+ Kb1 17. Rb8+ Ka1 18. Bb2+ Kb1 19.
Bxf6+ Kc1 20. Bg5+ Kd1 21. Rd8+ Ke1 22. Bd2+
Kd1 23. Bb4+ Kc1 24. Ba3+ Kb1 25. Rb8+ Ka1 26.
Bb2+ Kb1 27. Bxg7+ Kc1 28. Bh6+ Kd1 29. Rd8+
Ke1 30. Bd2+ Kd1 31. Bb4+ Kc1 32. Ba3+ Kb1 33.
Rb8+ Ka1 34. Be7H c1=QH 35. Bf6+H Qb2H 36.
Rxb2H e1=QH 37. Rb6+H Qe5H 38. Bxe5#H {HT} {0}
19838909 2:36.7 Mat38 11t 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Bxd4+ Kc1 4. Be3+
Kd1 5. Rd8+ Ke1 6. Bd2+ Kd1 7. Bb4+ Kc1 8. Ba3+
Kb1 9. Rb8+ Ka1 10. Bb2+ Kb1 11. Bxe5+ Kc1 12.
Bf4+ Kd1 13. Rd8+ Ke1 14. Bd2+ Kd1 15. Bb4+ Kc1
16. Ba3+ Kb1 17. Rb8+ Ka1 18. Bb2+ Kb1 19.
Bxf6+ Kc1 20. Bg5+ Kd1 21. Rd8+ Ke1 22. Bd2+
Kd1 23. Bb4+ Kc1 24. Ba3+ Kb1 25. Rb8+ Ka1 26.
Bb2+ Kb1 27. Bxg7+ Kc1 28. Bh6+ Kd1 29. Rd8+
Ke1 30. Bd2+ Kd1 31. Bb4+ Kc1 32. Ba3+ Kb1 33.
Rb8+ Ka1 34. Be7 c1=Q 35. Bf6+ Qb2 36. Rxb2
e1=Q 37. Rb6+ Qe5 38. Bxe5# {0}
20038704 2:39.1 Mat38 11. 1. Ba3+ Ka1 2. Bb2+ Kb1 3. Bxd4+ Kc1 4. Be3+
Kd1 5. Rd8+ Ke1 6. Bd2+ Kd1 7. Bb4+ Kc1 8. Ba3+
Kb1 9. Rb8+ Ka1 10. Bb2+ Kb1 11. Bxe5+ Kc1 12.
Bf4+ Kd1 13. Rd8+ Ke1 14. Bd2+ Kd1 15. Bb4+ Kc1
16. Ba3+ Kb1 17. Rb8+ Ka1 18. Bb2+ Kb1 19.
Bxf6+ Kc1 20. Bg5+ Kd1 21. Rd8+ Ke1 22. Bd2+
Kd1 23. Bb4+ Kc1 24. Ba3+ Kb1 25. Rb8+ Ka1 26.
Bb2+ Kb1 27. Bxg7+ Kc1 28. Bh6+ Kd1 29. Rd8+
Ke1 30. Bd2+ Kd1 31. Bb4+ Kc1 32. Ba3+ Kb1 33.
Rb8+ Ka1 34. Be7 c1=Q 35. Bf6+ Qb2 36. Rxb2
e1=Q 37. Rb6+ Qe5 38. Bxe5# {0}
And keeps this line.
I think, a search specially tuned for this could be extremely fast. For
practical games, it is probably not helpful and even hurting.
Regards,
Dieter
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