Author: Christophe Theron
Date: 09:47:37 06/16/02
Go up one level in this thread
On June 16, 2002 at 01:37:46, Peter McKenzie wrote:
>On June 16, 2002 at 00:15:48, Christophe Theron wrote:
>
>>On June 15, 2002 at 21:20:17, Peter McKenzie wrote:
>>
>>>On June 15, 2002 at 21:14:39, Mike S. wrote:
>>>
>>>>P3/700, 96 MB hash, CB-Tigers
>>>>
>>>>Analysis by Gambit Tiger 2.0:
>>>>
>>>>1...Be6 2.a4 Bd7 3.Rd1 Bf8 4.Qf4 Bg7
>>>> = (-0.20) Depth: 7 00:00:00 70kN
>>>> = (-0.02) Depth: 7 00:00:01 310kN
>>>>1...Bd7 2.Rd1 Bc5 3.Qf4 Be6 4.Nf3
>>>> = (-0.08) Depth: 7 00:00:02 366kN
>>>>1...f6 2.f4 Bf5 3.Bxf5 Nf7 4.Rxe8+ Rxe8 5.Qh4 gxf5 6.Nf3 Bc5+ 7.Kf1 Kg7 8.Qg3+
>>>>Kf8
>>>> = (-0.10) Depth: 7 00:00:03 577kN
>>>> = (0.08) Depth: 11 00:00:32 5336kN
>>>>1...Be6 2.Qh4 Rac8 3.Nf1 Qb6 4.Ne3 Bb8 5.Bd2 Nc4 6.Nxc4 dxc4
>>>> = (0.02) Depth: 11 00:01:43 16645kN
>>>>1...b5 2.Rd1 b4 3.Nb1 Rb8 4.Ba4 Nc6 5.cxb4 Rxb4 6.Bb3 d4
>>>> = (-0.02) Depth: 11 00:02:54 28306kN
>>>> = (-0.02) Depth: 11 00:02:54 28306kN
>>>>
>>>>-----
>>>>
>>>>New game
>>>>r1b1r1k1/ppq2p1p/3b2pQ/3pn3/8/2P4P/PPBN1PP1/R1B1R1K1 b - - 0 1
>>>>
>>>>Analysis by Chess Tiger 14.0:
>>>>
>>>>1...Bd7 2.Rd1 f5 3.Bb3 Bc6 4.Nf1 Nf7
>>>> ³ (-0.26) Depth: 6 00:00:00 67kN
>>>> = (0.02) Depth: 7 00:00:00 118kN
>>>>1...Be6 2.Rd1 f6 3.Nb3 Nf7 4.Qh4 Bh2+ 5.Kh1 Be5 6.Be3
>>>> = (-0.14) Depth: 7 00:00:02 391kN
>>>> = (0.00) Depth: 9 00:00:08 1256kN
>>>>1...b5 2.Rd1 b4 3.Nb1 Ba6 4.Qg5 d4 5.Ba4 Be7 6.Qf4 dxc3 7.Bxe8 Rxe8 8.bxc3 bxc3
>>>> = (-0.04) Depth: 9 00:00:23 3574kN
>>>> = (0.02) Depth: 10 00:00:35 5100kN
>>>>1...Be6 2.Rd1 b5 3.Nf1 f5 4.Ne3 Nc4 5.a4 Bf8 6.Qg5 Be7
>>>> = (-0.02) Depth: 10 00:00:39 5707kN
>>>> = (0.02) Depth: 11 00:01:13 11074kN
>>>>1...f6 2.Qh4 Qf7 3.f4 Nc6 4.Rxe8+ Qxe8 5.Nf3 Bd7 6.Qf2 Qf7 7.Be3 Re8
>>>> = (0.00) Depth: 11 00:02:12 20588kN
>>>>1...f5 2.f4 Bf8 3.Qh4 Be7 4.Qg3 Nc4 5.Nxc4 dxc4 6.Be3 Bd7 7.Qf3
>>>> = (-0.02) Depth: 11 00:02:55 26127kN
>>>> = (-0.02) Depth: 11 00:02:55 26127kN
>>>>
>>>>IOW, not in 3 minutes on this computer.
>>>
>>>Thanks Mike, the result was as I suspected :-)
>>
>>
>>
>>I don't know what you suspected but I have news for you: the latest Chess Tiger
>>finds Bf5 (on fail high) in 64 seconds on my P4-1.6GHz (96Mb hash).
>>
>>Just out of curiosity: what did you suspect???
>
>I suspected that Tiger would be a bit slow on this position (relative to the
>other strong programs that is). I figured its pruning would have some trouble
>with this particular case...
That is maybe the case, yes. I don't care much about solving test suites faster.
I know that if I wanted to I could. We all know that it is easy to extend more
aggressively on checks, responses to checks with few legal moves, recaptures and
so on.
But that makes the program weaker overall.
What I like the most is to work in making the program stronger overall (say "in
real games"), and then notice that it gets better scores on test suites.
I remember it happened on the Louguet Chess Test 2 with version 12.0. I was
happy with that.
There are lots of positions where Tiger does not perform well and has "tactical
holes". That's OK with me, because after all human players have exactly the same
problems, even the strongest. I still believe human players have a superior
search, and having such holes is a part of it.
Christophe
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.