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Subject: Re: Aristarch 4.50 blunders in a won position?!

Author: Joachim Rang

Date: 04:55:48 11/15/04

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On November 15, 2004 at 00:37:48, Graham Banks wrote:

>8/2n2r2/2PQ4/P2P2pk/3P3p/1q5P/1P4PK/4R3
>White to move
>
>If somebody could convert this fen string into a diagram (I don't know how) and
>then see what Aristarch 4.50 plays, I'd appreciate it.
>In Super Tournament III Final at 40/2hrs, the game Aristarch 4.50 v Deep Junior
>8 continued Re3 (after 7 minutes thought!); Qxe3, g4+ and the rest needs no
>explanation!
>I'm wondering if Aristarch 4.50 will duplicate this for others.


Yes Aristarch has a problem with this position. On my machine it considers Re3??
on depth 13 only to reject it on depth 14. On my machine (Athlon@ 1540 MHz)
however it switches to a6 after about 2 minutes. Here is the output under Arena:

FEN: 8/2n2r2/2PQ4/P2P2pk/3P3p/1q5P/1P4PK/4R3 w - - 0 1

Aristarch 4.50:
2/2- 00:00 2 0 -0,42 1.Qxc7
2/2 00:00 3 0 -2,67 1.Qxc7
2/6+ 00:00 72 0 -2,66 1.g4+ hxg3+ 2.Qxg3 Nxd5
2/6+ 00:00 140 0 -2,46 1.g4+ hxg3+ 2.Qxg3 Nxd5
2/7 00:00 233 0 +2,08 1.g4+ hxg3+ 2.Qxg3 Qxg3+ 3.Kxg3 Nxd5
2/7+ 00:00 297 0 +2,09 1.a6 Nxd5
2/7+ 00:00 337 0 +2,29 1.a6 Nxd5
2/7 00:00 378 0 +3,61 1.a6 Nxa6
2/7+ 00:00 430 0 +3,62 1.Qe5 Nxd5
2/7 00:00 468 0 +3,62 1.Qe5 Qxd5
2/7+ 00:00 536 0 +3,63 1.Re4 Nxd5
2/7+ 00:00 576 0 +3,83 1.Re4 Nxd5
2/7 00:00 621 0 +3,99 1.Re4 Qg3+ 2.Qxg3
3/7- 00:00 762 0 +3,57 1.Re4 Qxd5 2.Qxd5
3/7 00:00 928 0 +2,49 1.Re4 Qxd5 2.Qxd5
3/7+ 00:00 1.048 0 +2,50 1.Qe5 Qxd5 2.Qh8+ Kg6
3/7+ 00:00 1.131 0 +2,70 1.Qe5 Qxd5 2.Qh8+ Kg6
3/7 00:00 1.302 0 +3,72 1.Qe5 Qg3+ 2.Qxg3
4/10- 00:00 2.597 0 +3,30 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qxh4
4/10 00:00 2.855 0 +3,14 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Kh5
4/10+ 00:00 5.263 0 +3,15 1.Re5 Qxb2 2.Re4 Qa1
4/10+ 00:00 5.803 0 +3,35 1.Re5 Qxb2 2.Re4 Qa1
4/10 00:00 6.444 0 +3,39 1.Re5 Qxb2 2.Re4 Qf2
5/11- 00:00 7.845 0 +2,97 1.Re5 Qg3+ 2.Kg1 Qf2+ 3.Kh1 Qxd4 4.Qb4
5/14 00:00 8.820 0 +0,15 1.Re5 Qg3+ 2.Kg1 Qf2+ 3.Kh1 Qf1+ 4.Kh2 Qf4+ 5.g3 Qxg3+
6.Kh1 Qxh3+
5/14+ 00:00 9.122 0 +0,16 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Kh5
5/14+ 00:00 9.420 0 +0,36 1.Qe5 Qxd5
5/14 00:00 11.140 0 +2,85 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5
5/14+ 00:00 12.882 0 +2,86 1.a6 Qxd5 2.Qxd5 Nxd5
5/14 00:00 13.928 0 +2,99 1.a6 Qxd5 2.Qxd5 Nxd5 3.Re5 Nc7
6/14 00:00 22.218 0 +2,86 1.a6 Qxd5 2.Qxd5 Nxd5 3.Re8 Nf6 4.Rh8+ Nh7
7/18 00:00 56.367 0 +2,66 1.a6 Qxd5 2.Qxd5 Nxd5 3.Ra1 Rf6 4.a7 Nc7 5.b3
7/18+ 00:00 60.411 0 +2,67 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5
7/18+ 00:00 64.145 0 +2,87 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.a6 Nc7
7/18 00:00 78.710 0 +2,92 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re5 Nc7
8/21+ 00:00 118.003 0 +3,34 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re5
Nc7 6.b4
8/21 00:00 174.339 0 +3,46 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re5
Nc7 6.b4
9/21- 00:01 241.612 0 +3,04 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re5
Nc7 6.b4 Rf7
9/22 00:01 318.055 0 +2,85 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re5
Nc7 6.b4 Rf7
10/26 00:01 640.952 0 +2,80 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5 5.Re6+
Kh5 6.Re5 Nc7 7.b4 Rf7 8.a6 Nxa6 9.d5
11/26 00:03 1.490.222 0 +2,66 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Re5 Qd6 4.Qg8+ Rg7 5.Qc4
Re7 6.Qd3+ Kh6 7.Qe4 Rxe5
12/28 00:09 4.674.600 501.760 +2,43 1.Qe5 Qxd5 2.Qh8+ Kg6 3.Qg8+ Rg7 4.Qxd5 Nxd5
5.Re6+
12/30+ 00:11 5.327.033 501.379 +2,44 1.a6 Qxd5 2.Qxd5 Nxd5 3.Ra1 Ra7 4.Ra5 Nc7
5.d5 Rxa6 6.Rxa6 Nxa6 7.d6 Kh6
12/30+ 00:11 5.708.966 501.672 +2,64 1.a6 Qxd5 2.Qxd5 Nxd5 3.Ra1 Ra7 4.Ra5 Nc7
5.d5 Rxa6 6.Rxa6 Nxa6 7.d6 Kh6
12/30 00:17 8.347.685 490.282 +3,23 1.a6 Qxd5 2.Qxd5 Nxd5 3.Ra1 Rf8 4.Ra5 Nb6
5.a7 Na8 6.d5
13/32- 00:23 10.580.550 458.382 +2,81 1.a6 Qxd5 2.Qxd5 Nxd5 3.Ra1 Rf8 4.Ra5 Nb6
5.a7 Na8 6.c7 Nxc7 7.a8Q Nxa8 8.Ra6
13/32 00:28 13.338.768 469.020 +2,69 1.a6 Qxd5 2.Qxd5 Nxd5
13/34+ 00:52 24.574.605 475.469 +2,70 1.Re3 Qxe3 2.g4+
13/34+ 00:53 25.056.739 476.029 +2,90 1.Re3 Qxe3 2.g4+
14/34- 00:54 25.703.524 475.017 +2,27 1.Re3 Qxe3 2.g4+ hxg3+ 3.Qxg3 Nxd5 4.Qxe3
Nxe3 5.d5
14/34 02:07 66.335.193 520.300 -5,40 1.Re3 Qxe3
14/34+ 02:09 67.199.444 521.265 -5,39 1.a6 Nxd5
14/34+ 02:10 67.765.819 521.973 -5,19 1.a6 Nxd5
14/35 03:40 109.159.623 497.465 +2,67 1.a6 Qxd5 2.Qxd5 Nxd5
15/38 05:48 168.883.917 484.582 +2,61 1.a6 Qxd5 2.Qxd5 Nxd5 3.Rc1 Ra7 4.Rc5 Rxa6
5.c7 Nxc7 6.Rxc7
15/38+ 06:04 176.681.931 485.016 +2,62 1.Qe5 Nxd5 2.Qh8+ Kg6 3.Re6+
16/38 10:16 295.046.188 478.924 +2,96 1.Qe5 Nxd5 2.Qh8+



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