Author: Chessfun
Date: 03:33:54 04/02/00
Go up one level in this thread
On April 02, 2000 at 04:41:41, Jeremiah Penery wrote: >On April 01, 2000 at 09:28:59, Laurence Chen wrote: > >>On March 31, 2000 at 02:29:31, Jeremiah Penery wrote: >> >>>This position came from Valentin Albillo's site, on one of the endgame pages. >>> >>>In this position: >>> >>>[D]8/8/8/8/3p4/2k1p3/2N1P3/3K4 w - - >>> >>>White is supposed to capture the first black pawn on ply 39 (move 20), and the >>>second one shortly after. I ran my modified Crafty on this with all 5-man TBs >>>to a depth of 45, with some strange results: >>> >>>White(1): 8/8/8/8/3p4/2k1p3/2N1P3/3K4/ w >>>analyze.White(1): end-game phase >>> clearing hash tables >>> time surplus 0.00 time limit 30.00 (3:00) >>> nss depth time score variation (1) >>><It's not very interesting until about here.> >>> 37-> 58:30 0.78 1. Ne1 Kb3 2. Nd3 Kc3 3. Ne5 Kb3 4. >>> Nd3 >>> 38 58:37 -- 1. Ne1 >>> 38 58:41 ++ 1. Ne1!! >>> 38 62:52 4.54 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. >>> Na2 Kb1 5. Nb4 Kb2 6. Nd5 Kb3 7. Nc7 >>> Kc3 8. Nb5+ Kc4 9. Nd6+ Kb3 10. Ne4 >>> Kb2 11. Nc5 Kc3 12. Ke1 Kb2 13. Ne6 >>> Kc3 14. Nf4 Kc4 15. Kf1 Kc5 16. Kg2 >>> Kd6 17. Nd3 Ke7 18. Kf3 Kf8 19. Ke4 >>> Kg7 20. Kxd4 Kf6 21. Kxe3 >>> >>><This is what the analysis shows should happen, approximately. Looks good so >>>far. We're into TBs now, but since it's too close to the leaf, Crafty doesn't >>>probe them here, I think.> >>> >>> 38-> 62:52 4.54 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. >>> Na2 Kb1 5. Nb4 Kb2 6. Nd5 Kb3 7. Nc7 >>> Kc3 8. Nb5+ Kc4 9. Nd6+ Kb3 10. Ne4 >>> Kb2 11. Nc5 Kc3 12. Ke1 Kb2 13. Ne6 >>> Kc3 14. Nf4 Kc4 15. Kf1 Kc5 16. Kg2 >>> Kd6 17. Nd3 Ke7 18. Kf3 Kf8 19. Ke4 >>> Kg7 20. Kxd4 Kf6 21. Kxe3 >>> 39 63:01 ++ 1. Ne1!! >>> 39-> 124:20 4.93 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. >>> Na2 Kb1 5. Nb4 Kb2 6. Nd5 Kb3 7. Nc7 >>> Kc3 8. Nb5+ Kc4 9. Nd6+ Kb3 10. Ne4 >>> Kb2 11. Nc5 Kc3 12. Ke1 Kb2 13. Ne6 >>> Kc3 14. Nf4 Kc4 15. Kf1 Kc5 16. Kg2 >>> Kd6 17. Nd3 Ke7 18. Kf3 Kf8 19. Ke4 >>> Kg7 20. Kxd4 Kf6 21. Kxe3 >>> 40 125:13 ++ 1. Ne1!! >>> 40-> 417:29 5.32 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. >>> Na2 Kb1 5. Nb4 Kb2 6. Nd5 Kb3 7. Nc7 >>> Kc3 8. Nb5+ Kc4 9. Nd6+ Kb3 10. Ne4 >>> Kb2 11. Nc5 Kc3 12. Ke1 Kb2 13. Ne6 >>> Kc3 14. Nf4 Kc4 15. Kf1 Kc5 16. Kg2 >>> Kd6 17. Nd3 Ke7 18. Kf3 Kf8 19. Ke4 >>> Kg7 20. Kxd4 Kf6 21. Kxe3 >>> >>><Still, looking good, as before.> >>> >>> 41 418:44 -- 1. Ne1 >>> 41 421:21 0.00 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc5 Kc4 4. >>> Ne4 d3 5. exd3+ <HT> >>> >>><What happened? The drawscore remains until...> >>> >>> 43-> 530:24 0.00 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc5 Kc4 4. >>> Ne4 d3 5. exd3+ <HT> >>> 44 548:34 ++ 1. Ne1!! >>> 44-> 1233:04 0.39 1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc5 Kc4 4. >>> Ne4 d3 5. exd3+ <HT> >>> 45 1234:35 ++ 1. Ne1!! >>> >>><Will the score go back up again? Will it find mate from the TBs?> >>> >>>I'm wondering if someone with a faster machine, with more memory (for TB cache, >>>primarily - my HD was going nuts, practically grinding my whole machine to a >>>halt) could run this until it sees mate. I'd like to know how far out it is. :) >>> >>>Thanks, >>>Jeremiah >>I tried with Hiarcs 7.32 in my Pentium III 500MHz, 128 MB Hashtable, with all 5 >>men tablebases. After playing the first key move 1. Ne1 it announces mate in >>43. However, when I play the next move for Black, it does not see mate !!! >>Would anyone know why? >>Laurence > >How long does it take to declare the mate in 43? That's pretty impressive, >since it's 40 ply before the position becomes a TB position, and I'm not sure >how close Hiarcs probes the TBs from the leaf nodes... After playing Re1 I had mine running now 1 hour depth 27/31 it don't see anything. Thanks.
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