Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Glaurung 1.01 small bug?

Author: Uri Blass

Date: 08:58:42 01/14/06

Go up one level in this thread


On January 14, 2006 at 11:35:55, Christos Gitsis wrote:

>This is the game:
>
>1.d4 Ng8f6 2.c4 e6 3.Nb1c3 Bf8b4 4.e3 O-O 5.Bf1d3 c5 6.Ng1f3 d5 7.O-O Nb8c6 8.a3
>Bb4a5 9.cxd5 exd5 10.dxc5 Ba5xc3 11.bxc3 Bc8g4 12.a4 Qd8a5 13.Ra1b1 Ra8b8
>14.Rb1b5 Bg4xf3 15.gxf3 Qa5c7 16.Bc1a3 Nc6e5 17.Bd3e2 Rf8e8 18.Qd1d4 h6 19.Rf1d1
>Re8e6 20.c4 Ne5xc4 21.Be2xc4 dxc4 22.Qd4xc4 Nf6e8 23.Rb5b1 Qc7c6 24.e4 Qc6c7
>25.Rb1b3 Re6g6 26.Kg1h1 Rb8d8 27.Rd1xd8 Qc7xd8 28.Qc4d3 Qd8h4 29.Qd3f1 Qh4f6
>30.Ba3c1 Qf6c6 31.Bc1e3 Ne8f6 32.Rb3b4 Nf6d7 33.Be3d4 Nd7xc5 34.Bd4xc5 Qc6xc5
>35.Rb4b3 Qc5c6 36.Rb3a3 b6 37.Ra3a1 Qc6c3 38.Qf1d1 Qc3b2 39.Qd1e1 Kg8h7 40.Qe1f1
>Rg6d6 41.Qf1e1 Qb2b3 42.Qe1e2 Rd6d4 43.a5 Qb3c3 44.Ra1a2 Qc3c1 45.Kh1g2 Rd4d6
>46.f4 Qc1xf4 47.axb6 Rd6g6 48.Kf1
>
>No repetition of moves.
>
>I tried again after reading your post, and it is strange: one time Glaurung
>finds Qc1+ immediately, and all the other times it sticks to 48...axb6 for at
>least 2-3 minutes and until depth 13 (after that I stop analysing).

It finds Qc1+ immediatly but for some reason when I played 48...axb6 and took
that move back it could not find it and prefered 48...axb6

I can add that for some reason I could not reproduce it even after deleting the
learning file.

After going backward and forward I could get different move when only at depth
13 it found Qc1+

I do not know what is the problem but I suspect that there is some hash bug.


,a - Glaurung 1.0.1, Blitz:4'+4"
[D]8/p4ppk/1P4rp/8/4Pq2/8/R3QP1P/5K2 b - - 0 1

Analysis by Glaurung 1.0.1:

48...axb6 49.f3 Qc1+ 50.Qe1
  µ  (-1.06)   Depth: 2/8   00:00:00
48...Rxb6 49.Kg2
  µ  (-1.14)   Depth: 2/8   00:00:00
48...Qxh2 49.Qf3 Rg1+ 50.Ke2
  -+  (-1.62)   Depth: 2/8   00:00:00
48...Qxh2 49.Qf3 Qg1+ 50.Ke2 Rf6
  µ  (-1.34)   Depth: 3/8   00:00:00
48...Qxh2 49.Qf3 axb6 50.Ke2
  -+  (-2.15)   Depth: 4/11   00:00:00
48...Qxh2 49.Qf3 axb6 50.Ke2 Re6 51.Qf5+ Kg8
  -+  (-2.17)   Depth: 5/12   00:00:00
48...Qxh2 49.Qf3 axb6 50.Ke2 Rf6 51.Qg3
  -+  (-2.18)   Depth: 6/14   00:00:00  8kN
48...Qxh2 49.Qf3 axb6 50.Qf5 Qc7 51.Ra8 Qc4+ 52.Ke1 Qc1+ 53.Ke2 Qc2+ 54.Ke3 Qc3+
55.Ke2
  -+  (-2.14)   Depth: 7/20   00:00:00  30kN
48...Qxh2 49.Qf3 axb6 50.Qf5 Qc7 51.Ra8 Qc4+ 52.Ke1 Qd3 53.Rb8
  -+  (-2.15)   Depth: 8/22   00:00:00  61kN
48...Qxh2 49.Qf3 Qg1+ 50.Ke2 Qb1 51.Rd2 Qb5+ 52.Rd3 Rf6 53.Qg3 Rxb6 54.f4 Qb2+
55.Kf3
  -+  (-2.29)   Depth: 9/28   00:00:00  238kN
48...Qxh2 49.Qf3 Qg1+ 50.Ke2 Qb1 51.Rd2 Qb5+ 52.Rd3 Rf6 53.Qg3 Rxb6 54.f4 Qb2+
55.Kf3
  -+  (-2.29)   Depth: 10/28   00:00:00  324kN
48...Qxh2 49.Qf3 Rf6 50.Qe3 axb6 51.Ke2 Re6 52.Ra6 f5 53.Rxb6 Rxb6 54.Qxb6 fxe4
  -+  (-2.46)   Depth: 11/32   00:00:03  1612kN
48...Qxh2 49.Qf3 Rf6 50.Qd3 Rxb6 51.Ke2 Qh5+ 52.Qf3 Qb5+ 53.Qd3 Qe5 54.Qd5 Rb2+
55.Rxb2 Qxb2+ 56.Ke3
  -+  (-2.46)   Depth: 12/36   00:00:07  3515kN
48...Qxh2 49.Qf3 Rf6 50.Qd3 Rxb6 51.Ke2 Qh5+ 52.Qf3 Qb5+ 53.Qd3 Qe5 54.Qd5 Rb2+
55.Rxb2 Qxb2+ 56.Ke3 Qc1+ 57.Kf3
  -+  (-2.45)   Depth: 13/41   00:00:29  14330kN
48...Qc1+ 49.Qe1 Rg1+ 50.Kxg1 Qxe1+ 51.Kg2 Qxe4+ 52.f3 Qg6+ 53.Kf2 Qxb6+ 54.Kg2
Qg6+ 55.Kf2 a5 56.f4 Qe6 57.Re2 Qh3 58.Ke1 Qh4+ 59.Rf2
  -+  (-7.25)   Depth: 13/41   00:00:36  18146kN
48...Qc1+ 49.Qe1 Rg1+ 50.Kxg1 Qxe1+ 51.Kg2 Qxe4+ 52.f3 Qg6+ 53.Kf2 Qxb6+ 54.Kg2
Qg6+ 55.Kf2 a5 56.Re2 Qb6+ 57.Kf1 a4 58.Kg2 Qe6 59.Rd2 a3
  -+  (-7.54)   Depth: 14/46   00:00:44  22782kN
48...Qc1+ 49.Qe1 Rg1+ 50.Kxg1 Qxe1+ 51.Kg2 Qxe4+ 52.f3 Qg6+ 53.Kf2 Qxb6+ 54.Kg2
Qg6+ 55.Kf2 a5 56.Re2 Qb6+ 57.Kg2 a4 58.h3 Qe6 59.Rd2 a3 60.Rd8
  -+  (-7.62)   Depth: 15/46   00:00:46  24066kN

(,  14.01.2006)

Uri



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.