[gnugo-devel] eyespace reading

[George Zhong]

Some eye patterns seems not suitable to be applied on the board edge.
Following condition (3.7.10, recognize_eye() in optics.c, line 1301)

      if (neighbors[mv] != gv->neighbors
          || marginal[mv] != gv->marginal
          || edge[mv] < gv->edge)

implies that GG hard code always take space on the edge as advantage, but it may be the opposite.

For example, Eye Pattern: 420, which yields 1-1-1-2, typically,

ooooo
o...o
ooo.xx
xxxxxx

the following position can also matches unexpectedly, and, of course, missing the vital point.

--------------------------
o...o
ooo.xx
xxxxxx

I am not sure which solution is side-effect free, setup constraints or split up those patterns?

 

George Zhong