Author: Ratko V Tomic
Date: 22:40:46 10/13/99
Go up one level in this thread
> you ought to play a program with a 1 ply depth limit, which is basically
> relying totally on that 'evaluation' you mentioned. I think you'll find
> that the evaluation is far stronger than just a "1 ply search with no
> evaluation at all".
Well, in all these years (since Challenger 7, back in 1981) never played at 1
ply level setting. But for the sake of test, and past my bed time, I played
couple games at "1 ply level," one against Fritz 5.32 and one against Crafty
16.6 (which was included in the Fritz shell, both programs used General.ctg book
which came with Fritz). Fritz got checkmated in 16 moves, Crafty in 20 moves,
the two little childish games are included below. I think, whatever evaluation,
it can't be but simple-minded overall (granted, some special patterns may
trigger extra calculations based on very precise knowledge, e.g. some not well
known endgame pattern matching, if they can ever get there). Who would make
those kinds of nps otherwise. On 400 Mhz Celeron, Fritz maybe spends at most few
hundred asm instructions per evaluation to get the 400 knps. So at one ply
setting, as you can see below, they fall for much too easy traps. (BTW, once out
of the book, does your version of Crafty, at 1 ply level reproduce moves that
the 16.6 makes?)
Since Fritz seems to be easier at this level, I wonder if anyone here would try
beating it in fewer than 16 moves at "1 ply level."
[Event "Level=1ply. "]
[Site "Lexington, MA"]
[Date "1999.10.14"]
[Round "?"]
[White "Tomic, Ratko"]
[Black "Crafty 16.6"]
[Result "1-0"]
[ECO "C42"]
[PlyCount "39"]
{32768kB, GENERAL.ctg. C400
} 1. e4 {0} 1... e5 {0} 2. Nf3 {2} 2... Nf6 {0} 3.
Nc3 {5} 3... Bb4 {0} 4. Bc4 {15} 4... Bxc3 {0} 5. dxc3 {12} 5... d6 {0} 6. Qd3
{10} 6... O-O {0.21/1 0} 7. Bg5 {4} 7... Nc6 {0.34/1 0} 8. h3 {8} 8... a6 {
-0.19/1 1} 9. a3 {4} 9... Bd7 {-0.35/1 0} 10. O-O {10} 10... Qe7 {0.04/1 0} 11.
Nh4 {14} 11... Rad8 {-0.01/1 0} 12. f4 {5} 12... b5 {-0.32/1 0} 13. Ba2 {6}
13... exf4 {-0.41/1 0} 14. Rxf4 {6} 14... Ne5 {-0.55/1 0} 15. Qf1 {20} 15...
Bc6 {-0.05/1 0} 16. Rxf6 {14} 16... gxf6 {-0.54/1 0} 17. Bxf6 {3} 17... Qd7 {
0.53/1 0} 18. Qf4 {9} 18... Rde8 {-0.51/1 0} 19. Qh6 {8} 19... Bxe4 {-1.58/1 0}
20. Qg7# {3} 1-0
[Event "Level=1ply. "]
[Site "Lexington, MA"]
[Date "1999.10.14"]
[Round "?"]
[White "Tomic, Ratko"]
[Black "Fritz 5.32"]
[Result "1-0"]
[ECO "B00"]
[PlyCount "31"]
{65536kB, GENERAL.ctg. C400
} 1. e4 {0} 1... Nc6 {0} 2. d4 {2} 2... e5 {0} 3.
d5 {4} 3... Nce7 {0} 4. d6 {2} 4... Nc6 {0.31/1 1} 5. dxc7 {7} 5... Qxc7 {
0.06/1 0} 6. Nc3 {3} 6... Nf6 {0.06/1 1} 7. Bg5 {7} 7... Bb4 {0.06/1 1} 8. Qd3
{9} 8... Bxc3+ {-0.16/1 1} 9. bxc3 {3} 9... Ng4 {-0.09/1 0} 10. Nf3 {11} 10...
O-O {-0.16/1 1} 11. h3 {4} 11... Nh6 {0.31/1 0} 12. Bxh6 {4} 12... gxh6 {
0.28/1 1} 13. Nh4 {7} 13... b6 {0.12/1 1} 14. Nf5 {3} 14... Bb7 {0.66/1 0} 15.
Qg3+ {7} 15... Kh8 {#1/1 0} 16. Qg7# {2} 1-0
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.