place ko blockers as appropriate

rules.lua

@@ -177,7 +177,7 @@ local function connected_search(pos, final_result, early_termination_filter)
         end
     end
 
-    final_result = final_result()
+    final_result = final_result(#group)
     final_result.stones = stones
     return final_result
 end
@@ -222,8 +222,8 @@ local function _check_captures_filter(node, count)
     end
 end
 
-local function _check_captures_final()
-    return {capture = true}
+local function _check_captures_final(count)
+    return {capture = count}
 end
 
 local function check_captures(pos)
@@ -321,17 +321,34 @@ function lc_liberties.handle_placement(pos)
             local node = check_position(new_pos)
             if (node:sub(1, 1) == "S") and (node:sub(2, -1) ~= our_stone) then
                 local captures = check_captures(new_pos)
-                captured = captured or captures.capture
+                if captures.capture then
+                    captured = (captured or 0) + captures.capture
+                end
+
                 captureses[#captureses+1] = captures
             end
         end
     end
 
     local allcaptured = {}
+    local ko
     if captured then
+        if captured == 1 then
+            for i,v in pairs(neighbor_dirs(pos)) do
+                local new_stone = check_position(pos + directions[v])
+                if (new_stone:sub(2, -1) == our_stone) or (new_stone:sub(1, 1) == "E") then
+                    goto noko
+                end
+            end
+
+            ko = true
+
+            ::noko::
+        end
+
         for i,v in pairs(captureses) do
             if v.capture then
-                local stone = minetest.get_node(v.stones[next(v.stones)]).name
+                local stone = check_position(v.stones[next(v.stones)]):sub(2, -1) -- minetest.get_node().name)
                 local count = 0
 
                 local proximal
@@ -340,6 +357,11 @@ function lc_liberties.handle_placement(pos)
                 for i2, v2 in pairs(v.stones) do
                     allcaptured[#allcaptured + 1] = v2
 
+                    if ko then
+                        -- save ko capture position, for adding ko marker in fx phase
+                        ko = {stone = stone, pos = v2}
+                    end
+
                     local under = check_position(v2 + down)
                     if (under:sub(1, 1) == "W") and (under:len() > 1) then
                         nodecore.sound_play("nc_fire_ignite", {gain = 1, pos = pos})
@@ -347,6 +369,7 @@ function lc_liberties.handle_placement(pos)
                     else
                         nodecore.set_loud(v2, {name = "air"})
                     end
+
                     count = count + 1
                     if (v2:distance(pos) < 2.3) then
                         proximal_c = proximal_c + 1
@@ -356,10 +379,11 @@ function lc_liberties.handle_placement(pos)
                     end
                 end
 
-                multi_eject(proximal, stone, 3, count)
+                multi_eject(proximal, modname .. ":stone_" .. stone, 3, count)
             end
         end
     else
+        -- if no capture was made, check for a self-capture and reject the move
         local captures = check_captures(pos)
         if captures.capture then
             local stone = minetest.get_node(pos).name
@@ -379,6 +403,10 @@ function lc_liberties.handle_placement(pos)
         smokecontrol(allcaptured[chosen], 90)
         allcaptured[chosen] = allcaptured[i]
     end
+
+    if ko then
+        nodecore.set_loud(ko.pos, {name = modname .. ":ko_" .. ko.stone})
+    end
 end
 
 function lc_liberties.handle_territory_fill(itemstack, placer, pointed_thing)
@@ -429,13 +457,12 @@ function lc_liberties.handle_territory_fill(itemstack, placer, pointed_thing)
 end
 
 function lc_liberties.handle_dig(pos, node, digger)
-    cache = {}
-
     local control = digger.get_player_control and digger:get_player_control()
     if (control and (control.aux1 or control.sneak))
                 ~=
             (minetest.registered_items[node.name].groups.go_territory_marker ~= nil)
                 then
+        cache = {}
 
         local stone = minetest.get_node(pos).name
 

stones.lua

@@ -140,10 +140,10 @@ local function reg(name, basename, basedef)
         node_box = {
             type = "fixed",
             fixed = {
-                {-7/16, -7/16, -7/16, 7/16, -5/16, -5/16},
-                {7/16, -7/16, -7/16, 5/16, -5/16, 7/16},
-                {7/16, -7/16, 7/16, -7/16, -5/16, 5/16},
-                {-7/16, -7/16, 7/16, -5/16, -5/16, -7/16},
+                {-5/16, -6/16, -5/16, 5/16, -5/16, -4/16},
+                {5/16, -6/16, -5/16, 4/16, -5/16, 5/16},
+                {5/16, -6/16, 5/16, -5/16, -5/16, 4/16},
+                {-5/16, -6/16, 5/16, -4/16, -5/16, -5/16},
             }
         },
 
@@ -157,7 +157,6 @@ local function reg(name, basename, basedef)
 
         groups = {
             snappy = 1,
-            falling_node = 1,
             stack_as_node = 1,
             ko_stone = 1,
             cheat = 1,