Re: [gnugo-devel] attack_either patches analysis

[Arend Bayer]

Hi Evan,

thanks for analysing this in detail,...

Evan wrote:

> I finally got around to analyzing the delta on the attack_either patches.
>
> 13x13:42     Properly solved
> 13x13:40     Accidental
> trevora:220  unsure, maybe accidental
> nngs3:670    Properly solved
>
>
>
> 13x13:42
>
> The following gtp should make it clear what's going on (fails without the
> patch, passes with)
>
> loadsgf games/mertin13x13/katsunari-gnugo2.W+4.sgf 126
> black L4
> defend_both N7 K4
> #? [0]
>
...but I think this is actually wrong. After black L4, white can defend
both strings with N3. It would be good to find out why GNU Go doesn't see
this with your patch.
(I haven't looked at the other test cases.)

Arend