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Subject: Re: Simple questions about bitboards

Author: Sune Fischer

Date: 01:51:27 09/21/03

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On September 21, 2003 at 04:25:17, Ricardo Gibert wrote:

>On September 21, 2003 at 04:07:39, Sune Fischer wrote:
>
>>On September 21, 2003 at 03:59:04, Ricardo Gibert wrote:
>>
>>
>>>Another reason I don't like BB's is it is just an accident that it is a good fit
>>>with western chess e.g. when you complete your BB program, try converting it to
>>>play Shogi (9x9 board) or Chinese chess (9x10 board). BTW, I know other
>>>approaches have the same problem too, so I also have the same concern about
>>>them.
>>
>>I think that there is some contradiction in what you ask for.
>>
>>I believe the more game specific an engine is, the more potential it has.
>>This goes for board structure, move ordering, pruning, extensions and
>>evaluation, everything.
>
>
>But are you being more game specific than you need to be? There is no question
>you are right to a certain degree, but I don't agree that you should chuck
>portability out the window either.

Well, whether you need to rewrite 95% or 100% doesn't seem like that big of a
deal to me.

Maybe mailbox will give you an advantage, many of the tricks should carry over
fairly straigt forward.

I think it's a big rewrite in any case.

>It is by no means clear to me that BB's are more efficient than other
>approaches, while those other approaches are more adaptable to other games in a
>efficient way. I would prefer to retain the option as much as *reasonably*
>possible.

It's clear to me BB are more efficient that all other approaches ;-)

Seriously, I think it would be foolish not to take advantage of the 8x8 board
being a power of two in all directions, this is native talk to the machines.

That the board also happens to have 64 squares in total is just an observation I
cannot overlook, such incredible luck comes once in a lifetime :)

-S.



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