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Subject: Re: Definition of branching factor?

Author: Tony Werten

Date: 10:14:12 02/03/01

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On February 03, 2001 at 12:00:55, Larry Griffiths wrote:

>On February 02, 2001 at 19:35:47, Tony Werten wrote:
>
>>
>>Quite normal when you evaluate with material only or eval=0
>>
>>>They tend to be much
>>>higher on even plys.
>>
>>Comes with (plain) alfa-beta. You try to get around it with nullmove, extensions
>>and an elaborated evaluation function.
>>
>>Some work left for you,
>>
>>Tony
>>
>Thanks Tony,
>
>I have not been able to get null move to work, but I will keep on trying.

I've found that the easiest way is to actually have a make_nullmove function
where you store the move, chance color_to_play, get rid off the enpassant
square, store hashkey etc. just as you would normally do with a make_move.

>I have done some extensions before, but dropped them when I converted from
>alpha/beta to negamax.

Don't you mean from negamax to alfa-beta ?
Easy extensions are "in check" and "passed pawn to 7th rank"

>I have no idea what elaborated evaluation means.

A "big" evaluation function.

Tony

>
>Larry.



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