I looked at the LaTeX formulas, the problem is that i'm not using the manhattan
distance as such. i.e. based on independant x and y when calculating.

I'm using arithmetic distance defined as follows

d(xi,yi,xc,yc) =

if (xi-xc)(yi-yc)>0
return max (xi-xc,yi-yc)
else
return abs(xi-xc) + abs(yi-yc)

based on a "c" point, i need to sum for all (xi,yi)

additionnaly, i'm computing integers only, so floor(x) has to be ...
reconsidered.

this doesnt prevent me from finding a solution :) the sum of all d(xi,yi,xc,yc)
can be written s the sum of sums depending on the cases. but it looks
complicated.

except for the calculation of c, i just disclosed the center of mass
calculations of MLA lol.

david

Selon david.malek@...:

>
> > In MLA, in line move generation is performed as follows
> >> Why add? Why not simply overwrite? It ought to be faster.
> True. But adding makes undo a substraction of the same numbers. Also it
> allowed
> me to define ranges for the move number, due to unchanged fields (0 values
> can
> be added to anything). It's probably the reason why it's still performed this
> way in MLA lol.
>
> > But i'm also searching for a faster move generation
> > I have previously posted a paperon how to do incremental computation of
> compactness.
> I found this paper long time ago lol, maybe i needed to understand it (gosh i
> dont know latex lol i'm a windows guy). I finally converted it to PDF, lol,
> you
> are right again. I'll most probably enhance the speed significantly
> (evaluation
> is about 30% of the time i use).
>
> > With respect to bitboards, I have not found a convincing case for them.
> oh yes, finding patterns and handling rotation is documented by the author of
> crafty too. your C is interesting. But trying to use the ONLY bitboards for
> center of mass computation, move generation, domove/undomove might be hard.
> Hmm
> this would even impact my search ... hmm for MLA 4.0 lol.
>
> >Seriously, though - I would really love to hear more about useful patterns.
> Oh yeah, i'll keep you posted, once i've understood why MLA 3.0 wins lol. As
> it
> questions connectivity, connectivity means radius-1 patterns.
>
> So well, i'm all set, i have good leads to increase speed, and probably good
> leads to increase strength :)
>
> What else would i need? Hmm maybe a good beer ;)
>
> David.
>
>