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Subject: Re: Chess Engine evaluation question

Author: Les Fernandez

Date: 22:11:46 11/30/03

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On December 01, 2003 at 00:38:28, Slater Wold wrote:

>On December 01, 2003 at 00:35:26, Les Fernandez wrote:
>
>>Anyone have any idea what the percentage is for a chess engine after say 90 sec
>>of analysis that one of the top 5 suggested moves is in fact the best move?  And
>>what percent of the time would you guess that after an additional 90 sec that an
>>alternate move is found and that it was not one of the top 5 choices after the
>>first 90 seconds?  And finally can crafty when it is done with its analysis
>>report the top 5 highest rated moves and if not what engine can do that?
>>
>>Thanks,
>>
>>Les
>
>Rebel tracks it by depth.  Here's my output:
>
>                 SEARCH OVERVIEW
>                 ===============
>
>Depth    Moves          Moves         Big Score
>       Searched        Changed         Changes
>
> 1       7118         0 =  0.0%        0 =  0.0%
> 2       7009      2832 = 40.4%     1900 = 27.1%
> 3       6988      2131 = 30.5%     1160 = 16.6%
> 4       6933      1856 = 26.8%      653 =  9.4%
> 5       6923      1777 = 25.7%      774 = 11.2%
> 6       6892      1504 = 21.8%      582 =  8.4%
> 7       6873      1403 = 20.4%      571 =  8.3%
> 8       6824      1264 = 18.5%      480 =  7.0%
> 9       6735      1247 = 18.5%      454 =  6.7%
>10       6509       924 = 14.2%      306 =  4.7%
>11       6077       904 = 14.9%      344 =  5.7%
>12       5276       665 = 12.6%      224 =  4.2%
>13       3984       473 = 11.9%      179 =  4.5%
>14       2473       216 =  8.7%      103 =  4.2%
>15       1415       113 =  8.0%       81 =  5.7%
>16        867        38 =  4.4%       52 =  6.0%
>17        543        17 =  3.1%       38 =  7.0%
>18        322         9 =  2.8%       28 =  8.7%
>19        240         9 =  3.8%       24 = 10.0%
>20        200         5 =  2.5%       11 =  5.5%
>21        165         2 =  1.2%        7 =  4.2%
>22        128         2 =  1.6%        8 =  6.3%
>23         96         1 =  1.0%        3 =  3.1%
>24         84         1 =  1.2%        5 =  6.0%
>25         74         1 =  1.4%        4 =  5.4%
>26         70         1 =  1.4%        1 =  1.4%
>27         66         2 =  3.0%        1 =  1.5%
>28         63         2 =  3.2%        1 =  1.6%
>29         63         1 =  1.6%        1 =  1.6%
>30         60         1 =  1.7%        1 =  1.7%
>31         58         0 =  0.0%        1 =  1.7%
>32         57         1 =  1.8%        1 =  1.8%
>33         56         0 =  0.0%        2 =  3.6%
>34         54         0 =  0.0%        1 =  1.9%
>35         52         0 =  0.0%        0 =  0.0%
>36         50         0 =  0.0%        0 =  0.0%
>37         49         0 =  0.0%        0 =  0.0%
>38         47         0 =  0.0%        0 =  0.0%
>39         45         0 =  0.0%        0 =  0.0%
>40         45         0 =  0.0%        0 =  0.0%
>41         44         0 =  0.0%        0 =  0.0%
>42         44         0 =  0.0%        0 =  0.0%
>43         42         0 =  0.0%        0 =  0.0%
>44         40         0 =  0.0%        0 =  0.0%
>45         40         0 =  0.0%        0 =  0.0%
>46         40         0 =  0.0%        0 =  0.0%
>47         40         0 =  0.0%        0 =  0.0%
>48         39         0 =  0.0%        0 =  0.0%
>49         39         0 =  0.0%        0 =  0.0%
>50         39         0 =  0.0%        0 =  0.0%
>51         37         0 =  0.0%        0 =  0.0%
>52         37         0 =  0.0%        0 =  0.0%
>53         37         0 =  0.0%        0 =  0.0%
>54         37         0 =  0.0%        0 =  0.0%
>55         37         0 =  0.0%        0 =  0.0%
>56         37         0 =  0.0%        0 =  0.0%
>57         37         0 =  0.0%        0 =  0.0%
>58         37         0 =  0.0%        0 =  0.0%
>59         37         0 =  0.0%        0 =  0.0%
>60         37         0 =  0.0%        0 =  0.0%

Hi Slater,

I am not sure I understand this output fully.  Moves changed percent is it based
on a number of games to the indicated ply depth?  Big score changes??  What type
of magnitude are we talking about here.  I thank you so much for your response
however I think I need to have an idea or atleast an approximation as to how
long it takes rebel to reach the listed depths.  I understand that it will vary
at times depending on the position but a good educated guess won't hurt for the
time being.

Thanks,

Les



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