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Subject: Re: Hard test position for chess programs( Steve Ham-Nimzo7.32)

Author: Jeff Lischer

Date: 09:37:39 06/17/00

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On June 16, 2000 at 19:44:14, Hans Gerber wrote:

>On June 16, 2000 at 18:18:25, Ed Schröder wrote:
>
>>On June 16, 2000 at 14:44:39, blass uri wrote:
>>
>>>[D]2rr4/1b1n1k2/3Bp3/pp4p1/2pPPp2/P4P2/1PB2KP1/R4R2 b - - 0 1
>>>
>>>The test is to avoid c3 that is not good because of b4.
>>>
>>>Nimzo7.32 failed and played c3 after 18 hours and now some moves after c3 it had
>>>to admit that Ham has more than 1 pawn advantage.
>>>
>>>I am interested in the results of other chess programs.
>>>

<snipped>

>>Rebel Century 2.0 (beta) running under EPD2DIAG plays 1..Nb6 after 2:59
>>but the score compared to 1..c3 is pretty small.
>>
>>00:11  10.00  -0.17  1..c3 2.b4 Rc4 3.bxa5 Nb8 4.Rh1 Rxd4 5.Rh7+ Kg6 6.Rxb7 Rd2+
>>00:18  10.02  -0.13  1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Rxh8 Rxh8 5.Be4 Rh2 6.Rc1 Bc6
>>00:32  11.00  -0.13  1..Nf6 2.e5 c3 3.bxc3 Ne8 4.Rac1 Nxd6 5.exd6 Rxd6 6.Rh1 Bd5
>>7.Rh7+ Kf6
>>00:39  11.01  -0.08  1..c3 2.b4 Nb6 3.Bc5 Nd7 4.Rfd1 Nxc5 5.bxc5 Kg6 6.Rab1
>>01:02  12.00  -0.11  1..c3 2.b4 Nb6 3.Bc5 Nd7 4.Rad1 Nxc5 5.bxc5 Rh8 6.Rh1 Bc6
>>02:17  13.00  -0.13  1..c3 2.b4 Rc4 3.Rad1 Nf6 4.Bc5 Nd7 5.Rh1 Nxc5 6.dxc5 Rxd1
>>7.Rxd1 Ke7 8.Rh1 g4
>>02:59  13.04  -0.10  1..Nb6 2.e5 c3 3.bxc3 Nc4 4.Rac1 Nxd6 5.exd6+ Rxd6 6.Rh1
>>Ba6 7.Bd3
>>04:30  14.00  -0.11  1..Nb6 2.e5 c3 3.bxc3 Nc4 4.Rac1 Nxd6 5.exd6 Rxd6 6.Rh1 Ba6
>>7.Rh7
>>11:55  15.00  -0.07  1..Nb6 2.e5 Nd5 3.Rh1 Rh8 4.Be4
>>
>>PC: Ahtlon 600, 60 MB hash table.
>>
>>Ed
>
>Ok, I play 2. Bc5, and now what does REBEL CENTURY do? Nd7 again? Then I play
>Bd6. Perhaps you give me please the line if REBEL does now plan c3 again? Or a
>draw?
>
>
>Hans Gerber

Here's what I get with an overnight analysis using Rebel Century 1.2
(Anti-GM=Strong, PC: PIII 600, 60 MB hash table):
:

00:15:08 14.00  -0.15   1..c3 2.b4 Nb6 3.Bc5 Nd7 4.Rad1
                       axb4 5.Bxb4 Nf6 6.Rh1 g4 7.e5 g3+  (535)
00:18:24 14.01  -0.10   1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Be4
                       Ba8 5.a4 b4 6.Rac1 Ne3 7.g3  (908)
00:30:46 15.00  -0.08   1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Be4
                       Ba8 5.Bc5 Ne3 6.a4 bxa4 7.Bb6 Rxh1  (1530)
01:08:38 16.00  -0.05   1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Be4
                       Ba8 5.Rac1 Ne3 6.Bc7 a4  (3034)
02:57:29 17.00  -0.06   1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Be4
                       Ba8 5.a4 b4 6.Rac1 Rxh1 7.Rxh1  (7548)
10:55:42 18.00  -0.02   1..Nf6 2.e5 Nd5 3.Rh1 Rh8 4.Be4

If after 1. .. Nf6, White plays Be5, Rebel is perfectly happy playing for draw
by repetition:

00:00:33 11.00  -0.04   2..c3 3.b4 Nd7 4.Bd6 Rc6 5.e5
00:00:48 11.03  0.00   2..Nd7 3.Bd6
00:00:57 12.00  0.00   2..Nd7 3.Bd6
00:01:31 13.00  0.00   2..Nd7 3.Bd6
00:03:13 14.00  0.00   2..Nd7 3.Bd6

Maybe I'll try a long analysis of 1. .. c3 to see how Rebel analyses the danger
following 2. b4.



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