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Subject: Re: Branching factor, make me confuse more that ever.

Author: Tom Kerrigan

Date: 16:29:18 04/04/00

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On April 04, 2000 at 17:44:03, leonid wrote:

>On April 04, 2000 at 11:53:29, Tom Kerrigan wrote:
>
>>On April 04, 2000 at 06:36:22, leonid wrote:
>>
>>>Simple things are not that simple that somebody would like to see. Recently
>>>(trying to find how I must fix my branching factor) I put two counter in my game
>>>(chess logic). This numbers are:
>>>
>>>1) Number of all nodes that logic (chess logic) see inside of given position.
>>>2) All the legal nodes (moves) that existe in all plies.
>>>
>>>Deviding those two numbers I recieved 7%.
>>>
>>>The same devision find already many months ago, and that worried me since, for
>>>the plies starting with ply 6 and up was around 21%. Problem is that best games
>>>represent proportion that is around 15%. I expect that I probably loose speed
>>>between ply 2 and 10 in some 1000%.
>>
>>Possibly because you don't have a quiecence search, or extensions, or do
>>iterative deepening.
>>
>>-Tom
>
>Could be, even if I doubt so. Reason for this is that all those quiecence search
>and extensions sound to me as the part of "partial search". If it is really so
>all those new factors will only make all comparison more obscure that ever. This
>is the primary reason why I tried to compare my logic on the ground on "brute
>force" "fixed depth" and no extensions to lead me astray.

Of course there will be differences between two chess programs. That's what
makes comparisons interesting. If you compare two of the same thing, the outcome
obviously won't be very interesting.

People compare chess programs every day, and the programs all have some sort of
selective ("partial") search. Sort of like racing cars. It's interesting to race
a Mazda against a Honda to see how well a rotary engine stacks up. But the Mazda
is still essentially the same as the Honda.

Again, what you're trying to do is like racing a sailboat against a car. It's
silly because they're totally different.

-Tom



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