Author: blass uri
Date: 03:09:53 10/25/98
Go up one level in this thread
On October 25, 1998 at 05:43:29, blass uri wrote:
>
>On October 25, 1998 at 04:41:34, Amit Kagan wrote:
>
>>The following game is taken from Mark Young's latest match.
>>
>>[Event "30"av"]
>>[Site "?"]
>>[Date "1998.10.24"]
>>[Round "10"]
>>[White "Junior 5.0"]
>>[Black "Fritz 5.00/16Bit"]
>>[Result "0-1"][ECO "C82"]
>>[WhiteElo "2430"]
>>[BlackElo "2576"]
>>[PlyCount "92"]
>>{W=24.5 ply, B=17.0ply} 1. e4 {0} 1... e5 {0} 2. Nf3 {0} 2... Nc6 {0} 3. Bb5 {0
>>} 3... a6 {0} 4. Ba4 {0} 4... Nf6 {0} 5. O-O {0} 5... Nxe4 {0} 6. d4 {0} 6...
>>b5 {0} 7. Bb3 {0} 7... d5 {0} 8. dxe5 {0} 8... Be6 {0} 9. c3 {0} 9... Bc5 {0}
>>10. Nbd2 {0} 10... O-O {0} 11. Bc2 {0} 11... Bf5 {0} 12. Nb3 {0} 12... Bg6 {0}
>>13. Nfd4 {0} 13... Bxd4 {0} 14. cxd4 {0} 14... a5 {0} 15. Be3 {0} 15... a4 {0}
>>16. Nd2 {0} 16... a3 {0} 17. Nxe4 {0} 17... axb2 {0} 18. Rb1 {0} 18... Bxe4 {0}
>>19. Rxb2 {0} 19... Qd7 {0} 20. Bd3 {White out of book 0} 20... Bxd3 {0} 21.
>>Qxd3 {0.27/14 53} 21... Rfb8 {Black out of book 0} 22. Rxb5 {0.27/15 65} 22...
>>Rxb5 {0.38/14 98} 23. Qxb5 {0.16/14 41} 23... Nxe5 {0.44/15 133} 24. Rb1 {
>>(Qb7) 0.18/15 87} 24... Qxb5 {0.16/14 89} 25. Rxb5 {0.19/14 19} 25... c6 {
>>0.28/13 105} 26. Rb6 {(Rb4) 0.13/17 87} 26... Nc4 {0.09/13 76} 27. Rxc6 {
>>0.10/18 89} 27... Kf8 {(f5) 0.25/12 60} 28. Rc5 {0.16/16 92} 28... Rxa2 {
>>0.34/12 55} 29. h4 {(g4) 0.18/15 74} 29... Ra5 {0.31/13 76} 30. Kh2 {
>>(Rxa5) 0.09/15 45} 30... Rxc5 {(Ke7) -0.59/15 38} 31. dxc5 {-1.78/20 25} 31...
>>Nxe3 {-0.66/13 44} 32. fxe3 {-1.89/20 28} 32... Ke7 {-1.00/17 36} 33. g4 {
>>(Kg3) -1.89/26 62} 33... Kd7 {(h6) -1.06/17 38} 34. Kg3 {-1.91/24 42} 34... Kc6
>>{-1.16/16 39} 35. g5 {(Kf4) -2.13/26 88} 35... Kxc5 {-1.78/16 20} 36. Kf4 {
>>-2.12/25 39} 36... Kc4 {-3.66/15 24} 37. Ke5 {-2.34/26 35} 37... Kd3 {
>>(h6) -5.25/14 12} 38. Kxd5 {-2.90/28 48} 38... Kxe3 {-5.25/16 9} 39. Kd6 {
>>-3.61/31 46} 39... Kf4 {-6.00/20 11} 40. Ke7 {-3.49/27 18} 40... Kg4 {
>>-8.97/22 13} 41. Kxf7 {-3.20/28 12} 41... g6 {-9.41/24 15} 42. Kg7 {
>>-10.47/38 41} 42... Kxh4 {-9.44/22 12} 43. Kh6 {-10.47/36 34} 43... Kg4 {
>>-9.97/25 81} 44. Kxh7 {-10.55/39 45} 44... Kxg5 {-#11/24 21} 45. Kg7 {
>>-10.62/38 38} 45... Kf5 {-#11/21 10} 46. Kf7 {(Kh6) -10.64/33 39} 46... g5 {
>>-#10/19 9} 0-1
>>
>>
>>30. Kh2 is a horrible move.
>>To me, it is surprising that a very decent chess program makes such a move,
>>since after two (obvious and only) captures, the position becomes a won pawn
>>ending for black.
>>I thought that capture-recapture extensions are supposed to help rejecting such
>>moves in a matter of seconds (at low depth).
>>Any opinions?
>
>1)Junior uses the half ply depth for capture-recapture moves(the depth is the
>number of important moves like capture-recaptures+2*the number of not important
>moves it sees).
>It is not enough and I think it should use negative depth for moves that leads
>to a pawn ending.
I do not understand the reason that Junior cannot see Kh2 is losing at depth 15
because after Kh2 Rxc5 it can see that white is losing at depth 12
and the depth of the line Kh2 Rxc5 is 3(Kh2-depth 2,Rxc5-depth 1)
so it should see at depth 15 that Kh2 is losing and not at depth 16.
What happened?
Maybe Amir Ban can answer.
Uri
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