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Subject: Re: Is the Depth directly proportional to the program's strength?

Author: William H Rogers

Date: 10:32:42 02/03/02

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Here is an item from Chess Skill in Man and Machine
One of the first programs written for computers and later turned into Deep Blue
well, I least I think that it lead to Deep Blue.
The ran a series of 300 games, playing the program against itself with only
different ply settings to see the difference in playing strength.
Here are the results:

    Rate  P4    P5    P6    P7    P8    P9
P4  1235  --    5.0          .5    0     0
P5  1570  15   --    3.5    3.0   .5     0
P6  1826  19.5 16.5  ---    4.0  1.5    1.5
P7  2031  20   17    16     ---  5.0    4.0
P8  2208  20   19.5  18.5  15.0  ---    5.5
P9  2328  20   20    18.5  16.0 14.5    ---

As you can see in the lower ply numbers the program gained the most strenght,
but as the ply level got higher the rating increase became smaller and smaller.
It would be nice to see some math on a curve to estimate the over all effects.
Bill



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