update

src/mcts.jl

@@ -513,13 +513,17 @@ function runMCTS(
     end
   end
 
-  best_child_state = argmax([child.statevalue / child.visits for child in values(root.children)])
+  avgStateValue = 0
+  selectedChildKey = nothing
+  for (k, v) in root.children
+    k_avgStateValue = v.statevalue / v.visits
+    if k_avgStateValue > avgStateValue
+      avgStateValue = k_avgStateValue
+      selectedChildKey = k
+    end
+  end
 
-
+  return root.children[selectedChildKey]
-
-
-
-  return best_child_state
 end