Author: Christophe Theron
Date: 14:52:02 10/30/99
Go up one level in this thread
On October 30, 1999 at 08:22:00, Enrique Irazoqui wrote:
>I have played 2 matches at game/5 between Tiger 12.0 and Crafty 16.18 as an
>engine for Fritz.
>
>Crafty played on a PIII-500, 64MB hashtables, the Nalimov tablebases that come
>with Fritz and the General book of Fritz 5 built after games of 2500+ players.
>
>Tiger 12.0 played on a PII-300, 32MB hashtables and the small book of Tiger 11.7
>with only 35000 positions.
Oops... Not exactly.
This book indeed comes from the first versions of Tiger 11.x but it contains
only 7682 moves.
This is 35 times smaller than the current book provided with Tiger 12.0.
> I used this book to compensate for Crafty not using
>its own. It was not uncommon to see Tiger out of book after 2, 3 or 4 moves. I
>don't think that the book gave Tiger any kind of advantage.
>
>In the first match, Tiger won 25-13, +19 -7 =12, scoring 65.7%
Wow! What elo rating difference would that mean?
>The second match was played under the same conditions, except that Tiger had PB
>off. In this second match, Tiger won 23-21, +16 -14 =14, scoring 52.2%.
>
>Going back to the discussion of a few weeks ago about PB on/off, these 2 matches
>seem to indicate that PB off is not more detrimental than what could be expected
>by just not using the usual 50% of the opponent's time.
>
>The delay in transmitting the moves through auto232 is almost 3 seconds/move for
>the dos driver and about 2/10 for the windows driver. Considering that the
>average in these matches is 79 moves/game, each game lasted 14 minutes instead
>of 10. Assuming that both programs guessed 50% of the opponent's moves, Tiger
>and Crafty used 9.5 minutes/game (5 + 4.5) each with PB on, while in the second
>match Tiger used 5 minutes/game. It is as if Tiger would have played the first
>match on a P300 and the second on a P150. All this mess (sorry) makes the
>results of both matches quite coherent.
>
>I tried all this PB on/off thing in a different way. Didzis plays with 2
>programs on one machine and PB off. I replayed with 2 machines one of his games
>Tiger-CM6K and both programs played the same moves.
>
>So it seems that for some programs playing with PB off has no other effect than
>having less time to compute.
Also it seems that a crippled Tiger is still better than a full strength Crafty
(PII-300/small book against PIII-500).
And it seems that a crippled crippled Tiger is still at least as strong as a
full strength Crafty (PII-300/PB off/small book against PIII-500).
I find this interesting as some time ago Bob was laughing at me because I'm
still using a 386sx20 for some of my tests and algorithmic improvements.
I would not be surprised if Chess Tiger 12.0 on PII-300 was able to stand Crafty
on a Quad-Xeon. After all that would only be a 4x speed advantage for Crafty. :)
Christophe
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