diff --git a/bofa/src/main/scala/bot/cortex/BugAI.scala b/bofa/src/main/scala/bot/cortex/BugAI.scala
index 16f5db1..3af831b 100644
--- a/bofa/src/main/scala/bot/cortex/BugAI.scala
+++ b/bofa/src/main/scala/bot/cortex/BugAI.scala
@@ -4,6 +4,7 @@ import bot.environment.topology.Point
 import bot.environment.Board
 import bot.Game
 import bot.environment.topology.Grid
+import bot.util.Log.dbg
 
 class BugAI extends Tactical {
   def evaluate(game: Game): Tactic = {
@@ -12,14 +13,19 @@ class BugAI extends Tactical {
     
     val weightGrid = new Grid(board.width, board.height, 0: Int)
     
-    for ( bug <- board.bugs; point <- board.walkablePoints(bug.point) ) {   
-      weightGrid(point).content += -1000
+    board.bugs foreach { weightGrid(_) put -1000 }
+    
+    for ( bug <- board.bugs; point <- board.walkablePoints(bug.point) ) {
+      val field = weightGrid(point)
+      field put (field.content - 1000)
     }
     
     board.walkableDirs(game.bofaPoint) foreach { dir =>
       tactic = tactic + {dir -> weightGrid(board.walk(game.bofaPoint)(dir)).content}
     }
     
+    dbg(s"$weightGrid")
+    
     tactic
   }
 }
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