Author: Laurence Chen
Date: 06:29:23 04/01/00
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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
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