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Subject: Re: Is this how Alpha-Beta results should look ?

Author: Tom Kerrigan

Date: 21:43:29 08/03/00

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On August 03, 2000 at 22:41:52, Larry Griffiths wrote:

>On August 03, 2000 at 21:53:15, Tom Kerrigan wrote:
>
>>Here's my output:
>>
>> 1       0.078           2    0.00  b1a3
>> 1.      0.078          21    0.00  b1a3
>> 2       0.078          43    0.00  b1a3 b8a6
>> 2.      0.094          85    0.00  b1a3 b8a6
>> 3       0.094         150    0.00  b1a3 b8a6 a3b5
>> 3.      0.094         615    0.00  b1a3 b8a6 a3b5
>> 4       0.094        1129    0.00  b1a3 b8a6 a3b5 a6b8
>> 4.      0.094        1936    0.00  b1a3 b8a6 a3b5 a6b8
>> 5       0.110        4290    0.00  b1a3 b8a6 a3b5 a6b8 b5d4
>> 5.      0.110       11334    0.00  b1a3 b8a6 a3b5 a6b8 b5d4
>> 6       0.125       19888    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6
>> 6.      0.157       34570    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6
>> 7       0.203       58783    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1
>> 7.      0.297      154233    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1
>> 8       0.453      281533    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>> 8.      0.938      504702    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>> 9       1.735      926376    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3
>> 9.      3.016     2192164    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3
>>10       5.625     4229084    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3 f7f5
>>10.     13.235     7847438    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3 f7f5
>>11      27.157    15284364    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3 f7f5 b1a1
>>11.     47.610    34122580    0.00  b1a3 b8a6 a3b5 a6b8 b5d4 b8a6 a1b1 g8h6
>>                                     g1h3 f7f5 b1a1
>>
>>It goes: ply, seconds, nodes, score, pv
>>
>>So nodes per second is 716710 on my Pentium III/800.
>>
>>(This is with material-only evaluation and no null moves.)
>>
>>-Tom
>
>Geez Tom,
>
>You went one more ply in half the time mine took.
>Guess I need to at least keep track of material and see if it reduces the time.

Sorry, I thought you were, so I did. I don't think you'll get any alpha-beta
cutoffs if your evaluation function only returns 0.

>Are your alpha and beta values set to + and - infinity in this test?

No, I use alpha-beta windows. I also use null windows.

>Why are there 2 lines for each ply?

The first line is when the search finds the pv for that ply. The second is when
the ply is finished.

-Tom



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