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Subject: Re: Testposition of Matador-Alarm CCT6

Author: Uri Blass

Date: 09:36:35 02/04/04

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On February 04, 2004 at 09:34:58, Ulrich Tuerke wrote:

>On February 03, 2004 at 17:00:31, Dan Ellwein wrote:
>
>>On February 03, 2004 at 04:06:22, Stefan Knappe wrote:
>>
>>>Hi guys,
>>>
>>>at first I'd like to thank Volker and Schroer for the organization of the
>>>tournament and the comments on the games!
>>>
>>>I am suprised about the fact, that yace and crafty don't like Matadors sacrifice
>>>against Alarm.
>>>
>>>What do you and your engines think about Rxe6? Matador prefers it after 2
>>>seconds with a score of +1. However it was interesting and successful :-)
>>>
>>>[D] 4k3/1pq2p1r/rnpbp3/p4pB1/P2P3P/1QN2PPK/1P2R3/7R w - - 0 26
>>>
>>>Have a nice day!
>>>
>>>Regards,
>>>Stefan
>>
>>complicated position...
>>
>>but it does look like Rxe6 does win...
>>
>>this looks to be the best continuation...
>>
>>CM9(modified) Cel 1.7G 32M hashtable WinXP SS=12
>>
>>1.Rxe6+ fxe6
>>2.Qxe6+ Re7
>>3.Qg6+	Kd8
>>4.Qxf5 Qd7
>>5.Qxd7+ Kxd7
>>6.Bxe7	Bxe7
>>7.Rd1 Nc4
>>8.b3 Ne3
>>9.Re1 Nf5
>>
>>Time	Depth	Score	Positions	Moves
>>----	----	----	----		----
>>0:00	1/3	1.83	2950		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8
>>0:00	1/4	2.05	7920		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8 6.Re1
>>0:00	1/5	2.07	23515		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8 6.Qf6+
>>					Kg8 7.Re1
>>0:00	1/6	2.06	93089		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8 6.Re1
>>					Ra8 7.Qf6+ Kg8
>>0:02	1/7	2.90	264339		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8 6.Qf6+
>>					Kg8 7.Qxf5 Kh8 8.Qg6
>>0:04	1/8	3.03	573572		1.Rxe6+ fxe6 2.Qxe6+ Kf8 3.Bh6+
>>					Rxh6 4.Qxh6+ Kg8 5.Qg6+ Kh8 6.Qf6+
>>					Kg8 7.Qxf5 Ra8 8.Qg6+ Kh8 9.Kg2
>
>
>So, there is an engine realizing after 4 secs that Rxe6 really is winning.
>Others (as mine) seems to select it for some "static bonus collection" reasons.
>
>Looks like The King has some quite special tctical extensions, which others
>don't have.
>
>Uli

I do not beliebve that chessmaster can see that Rxe6 is winning

The big score is probably based on one of the possible weak personalities for
chessmaster that overevaluates passed pawns.

If I follow the main line I cannot see a winning score for white even many moves
after the root position with Yace Padderborn

Even some minutes after the first 13 plies of the main line of chessmaster

Yace says that black is better

1. Rxe6+ fxe6 2. Qxe6+ Re7 3. Qg6+ Kd8 4. Qxf5 Qd7 5. Qxd7+ Kxd7 6. Bxe7 Bxe7
7. Rd1 *


New game
8/1p1kb3/rnp5/p7/P2P3P/2N2PPK/1P6/3R4 b - - 0 1

Analysis by Yace Paderborn:

7...Nxa4 8.Nxa4
  +-  (2.55)   Depth: 1   00:00:00
7...Bxh4 8.Kxh4
  +-  (2.51)   Depth: 1   00:00:00
7...Bb4
  =  (-0.05)   Depth: 1   00:00:00
7...Bd6
  =  (-0.18)   Depth: 1   00:00:00
7...Nc4
  =  (-0.20)   Depth: 1   00:00:00
7...Nc4
  =  (-0.20)   Depth: 1   00:00:00
7...Nc4 8.b3
  =  (-0.13)   Depth: 2   00:00:00
7...Nc4 8.b3
  =  (-0.13)   Depth: 2   00:00:00
7...Nc4 8.b3 Ne3
  =  (-0.23)   Depth: 3   00:00:00
7...Bb4 8.Ra1 Bd6
  =  (-0.24)   Depth: 3   00:00:00
7...Bb4 8.Ra1 Bd6
  =  (-0.24)   Depth: 3   00:00:00
7...Bb4 8.Ra1 Bd6
  =  (-0.24)   Depth: 3   00:00:00
7...Bb4 8.Rb1 Ra7 9.Ra1
  =  (-0.11)   Depth: 4   00:00:00
7...Bb4 8.Rb1 Ra7 9.Ra1
  =  (-0.11)   Depth: 4   00:00:00
7...Bb4 8.Rb1 Ra7 9.Ra1 Bd6
  =  (-0.24)   Depth: 5   00:00:00
7...Bb4 8.Rb1 Ra7 9.Ra1 Bd6
  =  (-0.24)   Depth: 5   00:00:00
7...Bb4 8.Ra1 Ra8 9.Ne4 Rh8 10.Kg2
  =  (-0.22)   Depth: 6/11   00:00:00  14kN
7...Bb4 8.Ra1 Ra8 9.Ne4 Rh8 10.Kg2
  =  (-0.22)   Depth: 6/14   00:00:00  20kN
7...Bb4 8.Ra1 Ra8 9.Ne4 Nc4 10.Nc5+ Bxc5 11.dxc5
  =  (-0.18)   Depth: 7/14   00:00:00  31kN
7...Bb4 8.Ra1 Ra8 9.Ne4 Nc4 10.Nc5+ Bxc5 11.dxc5
  =  (-0.18)   Depth: 7/15   00:00:01  50kN
7...Bb4 8.Rb1 Ra7 9.Ra1 Nc4 10.Nd1 Bd2 11.Kg2
  ³  (-0.28)   Depth: 8/15   00:00:01  120kN
7...Bb4 8.Rb1 Ra7 9.Ra1 Nc4 10.Nd1 Bd2 11.Kg2
  ³  (-0.28)   Depth: 8/19   00:00:01  146kN
7...Bb4 8.Rb1 Ra8 9.h5 Rh8 10.Kg4 Rg8+ 11.Kh3
  ³  (-0.32)   Depth: 9/19   00:00:01  343kN
7...Bb4 8.Rb1 Ra8 9.h5 Rh8 10.Kg4 Rg8+ 11.Kh3
  ³  (-0.32)   Depth: 9/23   00:00:01  405kN
7...Bb4 8.Ra1 Nc4 9.Rb1 Nxb2 10.Rxb2 Bxc3 11.Rxb7+ Ke6 12.g4 Bxd4 13.h5
  ³  (-0.28)   Depth: 10/23   00:00:03  1184kN
7...Bb4 8.Ra1 Nc4 9.Rb1 Nxb2 10.Rxb2 Bxc3 11.Rxb7+ Ke6 12.g4 Bxd4 13.h5
  ³  (-0.28)   Depth: 10/25   00:00:04  1456kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.g4 Ra2 12.Rg2 Nc4 13.b3 Rxg2
  ³  (-0.33)   Depth: 11/25   00:00:08  2842kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.g4 Ra2 12.Rg2 Nc4 13.b3 Rxg2
  ³  (-0.33)   Depth: 11/25   00:00:09  3189kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.h5 Nd5 12.Rf2 Ra1 13.h6 Rh1+ 14.Rh2
  =  (-0.24)   Depth: 12/26   00:00:13  4504kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.h5 Nd5 12.Rf2 Ra1 13.h6 Rh1+ 14.Rh2
  =  (-0.24)   Depth: 12/29   00:00:17  5968kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.h5 Nc4 12.Rc2 Ne3 13.Re2 Nf5 14.Re4
  ³  (-0.33)   Depth: 13/31   00:00:33  11676kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Nb6 11.h5 Nc4 12.Rc2 Ne3 13.Re2 Nf5 14.Re4
  ³  (-0.33)   Depth: 13/31   00:00:41  14332kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Ra5 11.Kg4 Nb6 12.Kf4 Nd5+ 13.Kf5 Nc3+
14.Kf4 Ra2 15.h5
  ³  (-0.46)   Depth: 14/36   00:01:35  34065kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Ra5 11.Kg4 Nb6 12.Kf4 Nd5+ 13.Kf5 Nc3+
14.Kf4 Ra2 15.h5
  ³  (-0.46)   Depth: 14/36   00:01:45  37558kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Ke6 11.h5 Kd5 12.g4 Kc4 13.h6 c5 14.g5
cxd4 15.b3+ Kxb3
  =  (-0.21)   Depth: 15/36   00:02:28  53387kN
7...Bb4 8.Na2 Nxa4 9.Nxb4 axb4 10.Rd2 Ke6 11.h5 Kd5 12.g4 Kc4 13.h6 c5 14.g5
cxd4 15.b3+ Kxb3
  =  (-0.21)   Depth: 15/36   00:04:12  89899kN

(Blass, Tel-Aviv 04.02.2004)

Uri



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