Author: Dieter Buerssner
Date: 02:08:45 01/07/01
Go up one level in this thread
On January 06, 2001 at 00:53:10, Uri Blass wrote:
>Here is a position(from game 5 of the match) when I believe that DB1 made a
>tactical mistake(I did not try to prove it by a tree but it is my impression).
>
>3r2k1/p4bp1/5q1p/8/3Npp2/1PQ5/P2R1PPP/6K1 w - - 0 1
>
>White played g3 when I believe that the only move is Ne2
>The tactics is quite(white has a lot of possibilities in every move) and this is
>the reason that the singular extensions could not help DB1.
>
>I think that it may be interesting to know how much time do programs need to
>find Ne2 and what is the depth that programs of today need to see significant
>difference between g3 and Ne2.
After a really long time, Yace sees a difference of 0.3 between g3 and
Ne2 (pawn value is 0.8). It also shows Rd5 as reply to g3.
Note that the node counter overflew during the test. This also was tested
on a computer, that was relatively busy, at least during part of the time,
and therefore also with a relatively small hash of 20M. AMD K6-2 475.
Depth 15 had a very bad branching factor ...
nodes time score depth
21767004 3:34.2 -0.44 11t 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qf6 4.Qd8+ Qxd8
5.Nxd8 e3 6.Kf1 g5 7.Nxf7 Kxf7 {0}
56741894 9:49.6 -0.44 11. 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qf6 4.Qd8+ Qxd8
5.Nxd8 e3 6.Kf1 g5 7.Nxf7 Kxf7 {0}
82427993 14:28.2 -0.42 12t 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.g4
Qd6 6.Qc3 Kf8 7.Qc8+ Kg7 {HT} {-10}
118995125 21:10.4 -0.42 12. 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.g4
Qd6 6.Qc3 Kf8 7.Qc8+ Kg7 {HT} {-10}
197551069 32:51.6 -0.46 13t 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.a4
Kf8 6.Kf1 a5 7.h3 Qd6 {-10}
344578607 51:09.9 -0.46 13. 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.a4
Kf8 6.Kf1 a5 7.h3 Qd6 {-10}
777852717 1:41:24 -0.46 14t 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.Kf1
Qe5 6.Qc3 e3 7.Qc8+ Be8 8.gxf4 gxf4 9.fxe3 fxe3
{-10}
953705364 2:02:36 -0.46 14. 1.g3 Qg5 2.Nc6 Rxd2 3.Qxd2 Qc5 4.Nd4 g5 5.Kf1
Qe5 6.Qc3 e3 7.Qc8+ Be8 8.gxf4 gxf4 9.fxe3 fxe3
{-10}
3623500760 7:17:16 -0.86 15-- 1.g3 Rd5 2.Qc8+ Kh7 3.Qc3 Qe5 4.gxf4 Qxf4 5.Qc2
Rg5+ 6.Kh1 Bxb3 7.axb3 Qg4 8.Qd3 exd3 9.f3 Qxd4
10.Rd1 {-1081}
4194959670 8:18:26 -0.94 15t 1.g3 Rd5 2.Qc8+ Kh7 3.Qc3 Qe5 4.gxf4 Qxf4 5.Qe3
Rg5+ 6.Kf1 Qxh2 7.Qxe4+ Bg6 8.Qe3H {HT} {-10}
1261278366 11:38:58 -0.72 15t 1.h3 Kh7 2.g3 g5 3.a4 Qe5 4.gxf4 gxf4 5.Kf1 Be6
6.h4 e3 7.Rd3 Bh3+ 8.Ke1 Bg2 9.b4 {-10}
2911352341 14:20:48 -0.71 15t+ 1.Ne2 Rxd2 2.Qxd2 Qa1+ 3.Nc1 f3
3148632386 14:43:28 -0.64 15t 1.Ne2 Rxd2 2.Qxd2 Qa1+ 3.Nc1 Qe5 4.Ne2 e3
5.fxe3 fxe3 6.Qd8+ Kh7 7.Qd4 Qxd4 8.Nxd4 Bh5
9.Kf1 a5 10.Nf5 e2+ 11.Ke1 {HT} {-10}
3168337215 14:45:25 -0.64 15. 1.Ne2 Rxd2 2.Qxd2 Qa1+ 3.Nc1 Qe5 4.Ne2 e3
5.fxe3 fxe3 6.Qd8+ Kh7 7.Qd4 Qxd4 8.Nxd4 Bh5
9.Kf1 a5 10.Nf5 e2+ 11.Ke1 {HT} {-10}
Uri, recently you have posted a difficult position from a correspondence
game, perhaps one of yourself. Unfortunately I have lost the position, and
cannot find it here anymore easily. I believe the solution was Qg6 for white.
I remember, that after the solution move, black could give many checks with
the queen, but at some point, it was clear, that whit must be winning.
Is it possible, that you repost the position, or send it by mail to me?
Thanks in advance,
Dieter
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