gistfile1.txt

diff --git a/web/tableau/pile.dart b/web/tableau/pile.dart
index 7d8fdff..c0a3adb 100644
--- a/web/tableau/pile.dart
+++ b/web/tableau/pile.dart
@@ -5,10 +5,10 @@
 part of freecell.tableau;
 
 abstract class Pile {
-  ObservableList<Card> cards;
+  List<Card> cards;
 
   Pile() {
-    cards = new ObservableList<Card>();
+    cards = new List<Card>();
   }
 
   bool get isEmpty => cards.isEmpty;