stop stones will default to placing a single stone, and matching color, if placed on top of a go stone

rules.lua

@@ -355,8 +355,9 @@ function lc_liberties.handle_territory_fill(itemstack, placer, pointed_thing)
         return ret
     end
 
+    local under
     if (pointed_thing and pointed_thing.under) then
-        local under = minetest.get_node(pointed_thing.under)
+        under = minetest.get_node(pointed_thing.under)
         local override_rightclick = minetest.registered_nodes[under.name].on_rightclick
         if override_rightclick then
             return override_rightclick(pointed_thing.under, under, placer, itemstack, pointed_thing)
@@ -364,8 +365,17 @@ function lc_liberties.handle_territory_fill(itemstack, placer, pointed_thing)
     end
 
     if pointed_thing and pointed_thing.above then
-        cache = {}
+        if under then
+            local reg_item = minetest.registered_items[under.name]
+
+            if reg_item and reg_item.groups and reg_item.groups.go_stone then
+                nodecore.set_loud(pointed_thing.above, {name = modname .. ":territory_" .. reg_item.go_team})
+                itemstack:set_count(itemstack:get_count() - 1)
+                return itemstack
+            end
+        end
 
+        cache = {}
         local territories = territory_search(pointed_thing.above, itemstack:get_count())
         if territories.team then
             local piece = modname .. ":territory_" .. territories.team