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Subject: Re: how much does eval effect strength?

Author: Uri Blass

Date: 05:56:25 09/18/03

Go up one level in this thread


On September 18, 2003 at 08:35:14, Vincent Diepeveen wrote:

>On September 18, 2003 at 08:30:49, Tony Werten wrote:
>
>>On September 18, 2003 at 08:11:49, Vincent Diepeveen wrote:
>>
>>>On September 18, 2003 at 07:36:25, Tony Werten wrote:
>>>
>>>>On September 18, 2003 at 06:30:27, macaroni wrote:
>>>>
>>>>>thats an example position it got to, it gives about a -0.1 for that position,
>>>>>when clearly it is hopeless, the pawns broken up, and very bad pieces.
>>>>
>>>>The position doesn't seem to be lost ( for a computer that is )
>>>>
>>>>After 30 min XiniX still gives only -1 ( what it also gave after 1 sec.)
>>>>
>>>>Tony
>>>
>>>make that -10
>>
>>That looks like a better score, or at least -3 or something. Problem is that
>>XiniX doesn't see black getting through, so special eval code is activated wich
>>pulls the score closer to a draw.
>>
>>Tony
>
>What you mean to say is that your thing is missing a shitload of positional
>evaluation that shows a score closer to 3 than to 1.
>
>Score 1.0 is something even fritz might show based upon having isolated pawns +
>doubled pawn and a strong knight at e5.


shredder7.04 does not show clearly higher score and shredder score  are usually
higher than other program scores.

only +1.60 at depth 15,+1.35 at depth 16

New game
[D]2r5/1b2k1p1/p2pp2p/4n3/1pP1P3/8/P1PNB1PP/2K2R2 b - - 0 1

Analysis by Shredder 7.04:

1...a5
  -+  (-2.55)   Depth: 1/1   00:00:00
1...a5
  -+  (-2.55)   Depth: 1/1   00:00:00
1...a5 2.g3
  -+  (-2.67)   Depth: 2/4   00:00:00
1...a5 2.g3 Kd7
  -+  (-2.52)   Depth: 3/6   00:00:00
1...a5 2.Kb2 g5 3.g3
  -+  (-2.56)   Depth: 4/10   00:00:00
1...a5 2.Kb2 g5 3.c3 Nf3
  -+  (-2.31)   Depth: 5/12   00:00:00
1...a5 2.Kb2 Ba6 3.Rf3 Nxf3 4.gxf3
  -+  (-2.39)   Depth: 5/13   00:00:00
1...a5 2.Kb2 Ba6 3.a3 Nxc4+ 4.Nxc4 Bxc4 5.Bxc4 Rxc4 6.axb4 Rxb4+ 7.Kc3
  -+  (-2.37)   Depth: 6/13   00:00:00  13kN
1...a5 2.Kb2 Ba6 3.a3 Nxc4+ 4.Nxc4 Bxc4 5.Bxc4 Rxc4 6.axb4 Rxb4+ 7.Kc3
  -+  (-2.23)   Depth: 7/15   00:00:00  33kN
1...a5 2.Kb2 Ba6 3.Kb3 Nd7 4.Ka4 Rc5 5.a3
  -+  (-2.05)   Depth: 8/18   00:00:00  123kN
1...a5 2.Kb2 Ba6 3.Kb3 Nd7 4.c3 Kd8
  -+  (-1.80)   Depth: 9/20   00:00:01  309kN
1...a5 2.Kb2 Nd7 3.c3 Nc5 4.cxb4 axb4 5.Bh5 Nxe4 6.Rf7+ Kd8 7.Rxb7 Nxd2 8.Rxb4
Nxc4+ 9.Kc3
  -+  (-1.47)   Depth: 9/22   00:00:02  389kN
1...Rc5 2.Kb2 Ra5 3.Kb3
  -+  (-1.48)   Depth: 9/22   00:00:02  481kN
1...Rc5 2.Kb2 Ra5 3.Rc1 Ra4 4.c3 a5 5.Rb1 g5 6.cxb4 Rxb4+ 7.Kc2 Rxb1
  -+  (-1.55)   Depth: 9/22   00:00:02  533kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8
  -+  (-1.56)   Depth: 9/22   00:00:03  634kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8
  -+  (-1.72)   Depth: 9/22   00:00:03  689kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8 5.e5 dxe5 6.Nf3
  -+  (-1.69)   Depth: 10/22   00:00:05  1011kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rc7 4.Bg6 Kd8 5.Rf4 Kd7 6.a3 a5 7.axb4
  -+  (-1.65)   Depth: 11/25   00:00:09  1810kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rc7 4.Rf7+ Kd8 5.Rf4 Kd7 6.Bd1 g5 7.c3
  -+  (-1.67)   Depth: 12/29   00:00:18  3752kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rc7 4.Rf7+ Kd8 5.Rf8+ Kd7 6.Rg8 Kc6 7.Bg6
  -+  (-1.62)   Depth: 13/29   00:00:32  6849kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8 5.Bf3 e5 6.a3 bxa3+ 7.Kxa3 a5 8.g4 Ke7
  -+  (-1.66)   Depth: 14/29   00:01:05  13548kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8 5.Bf3 e5 6.a3 bxa3+ 7.Kxa3 a5 8.h4 Ke7
  -+  (-1.60)   Depth: 15/29   00:01:55  23749kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8 5.Bf3 e5 6.c3 Na4+ 7.Kc2 Nxc3 8.Kb3 g6
  µ  (-1.35)   Depth: 16/32   00:03:18  40523kN
1...Nd7 2.Kb2 Nc5 3.Bh5 Rf8 4.Rxf8 Kxf8 5.Bf3 Ke8 6.e5 Bxf3 7.Nxf3 Ke7 8.exd6+
  µ  (-1.35)   Depth: 16/32   00:03:39  44527kN

(Blass, Tel-Aviv 18.09.2003)

Uri



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