invert goban corners/edges... I'm so sorry to change this after release, but it was done for 2 reasons:

- edgy etching looks less bad on the sides of a raised goban with this orientation
- if digging out an area for your goban, you can now place edgy from inside the playable area, instead of having to dig out extra space to place it from

rules.lua

@@ -58,9 +58,9 @@ local function _check_position_uncached(pos)
 
     if reg_item.pattern_def then
         if reg_item.pattern_def.name == "edgy" then
-            return "WE" .. node.param2
+            return "WE" .. ((node.param2+2)%4)
         elseif reg_item.pattern_def.name == "corny" then
-            return "WC" .. node.param2
+            return "WC" .. ((node.param2+2)%4)
         elseif reg_item.pattern_def.name == "crossy" then
             return "WB"
         elseif reg_item.pattern_def.name == "starcrossy" then