diff --git a/.idea/.idea.Life/.idea/contentModel.xml b/.idea/.idea.Life/.idea/contentModel.xml
index b440801..c6f9d81 100644
--- a/.idea/.idea.Life/.idea/contentModel.xml
+++ b/.idea/.idea.Life/.idea/contentModel.xml
@@ -13,6 +13,7 @@
           <e p="GameOfLife.cs" t="Include" />
           <e p="IAutomaton.cs" t="Include" />
           <e p="IField.cs" t="Include" />
+          <e p="IRule.cs" t="Include" />
           <e p="MooreField.cs" t="Include" />
         </e>
         <e p="AutomatonField.xaml" t="Include" />
diff --git a/Life/Automaton/BasicField.cs b/Life/Automaton/BasicField.cs
index ac32053..bf196df 100644
--- a/Life/Automaton/BasicField.cs
+++ b/Life/Automaton/BasicField.cs
@@ -40,9 +40,9 @@ namespace Life.Automaton
 
         public abstract IEnumerable<Cell> Neighbours(int x, int y);
 
-        public void Transform(Rule transform)
+        public void Transform(IRule rule)
         {
-            _cells = transform(this);
+            _cells = rule.Next(this);
             
             Notify();
         }
diff --git a/Life/Automaton/GameOfLife.cs b/Life/Automaton/GameOfLife.cs
index 136063a..ac5e891 100644
--- a/Life/Automaton/GameOfLife.cs
+++ b/Life/Automaton/GameOfLife.cs
@@ -1,24 +1,27 @@
 using System;
-using System.IO;
 using System.Linq;
-using System.Runtime.Serialization;
 
 namespace Life.Automaton
 {
     [Serializable]
     public class GameOfLife : IAutomaton
     {
-        public GameOfLife(int width, int height)
+        [Serializable]
+        public class StandardRule : IRule
         {
-            Field = new MooreField(width, height);
-        }
+            private string survive;
+            private string born;
+
+            public StandardRule(string born, string survive)
+            {
+                this.born = born;
+                this.survive = survive;
+            }
 
-        public static Rule MakeRule(string born, string survive)
-        {
             bool WillSurvive(int neighbours) => survive.Contains(neighbours.ToString());
             bool WillBorn(int neighbours) => born.Contains(neighbours.ToString());
             
-            return field =>
+            public Cell[,] Next(IField field)
             {
                 var @new = new Cell[field.Size.Width, field.Size.Height];
 
@@ -36,10 +39,15 @@ namespace Life.Automaton
                 }
                 
                 return @new;
-            };
+            }
+        }
+        
+        public GameOfLife(int width, int height)
+        {
+            Field = new MooreField(width, height);
         }
 
-        public Rule Rule { get; set; } = MakeRule("3", "32");
+        public IRule Rule { get; set; } = new StandardRule("3", "32");
 
         public int Iteration { get; private set; }
 
diff --git a/Life/Automaton/IField.cs b/Life/Automaton/IField.cs
index 1107314..11b4865 100644
--- a/Life/Automaton/IField.cs
+++ b/Life/Automaton/IField.cs
@@ -4,7 +4,6 @@ using Life.Misc;
 
 namespace Life.Automaton
 {
-    public delegate Cell[,] Rule(IField old);
     
     public interface IField : IObservable<IField>
     {
@@ -16,7 +15,7 @@ namespace Life.Automaton
 
         IEnumerable<Cell> Neighbours(int x, int y);
 
-        void Transform(Rule rule);
+        void Transform(IRule rule);
         void Notify();
 
         void Resize(int width, int height);
diff --git a/Life/Automaton/IRule.cs b/Life/Automaton/IRule.cs
new file mode 100644
index 0000000..8f6398a
--- /dev/null
+++ b/Life/Automaton/IRule.cs
@@ -0,0 +1,7 @@
+namespace Life.Automaton
+{
+    public interface IRule
+    {
+        Cell[,] Next(IField old);
+    }
+}
\ No newline at end of file
diff --git a/Life/ViewModel/AutomatonViewModel.cs b/Life/ViewModel/AutomatonViewModel.cs
index 1657ef1..5e68e3e 100644
--- a/Life/ViewModel/AutomatonViewModel.cs
+++ b/Life/ViewModel/AutomatonViewModel.cs
@@ -147,11 +147,7 @@ namespace Life.ViewModel
             if (dialog.ShowDialog() == true)
             {
                 using var file = dialog.OpenFile();
-                var field = _formatter.Deserialize(file) as IField;
-                
-                Automaton.ReplaceField(field);
-                
-                OnPropertyChanged(nameof(Field));
+                Automaton = _formatter.Deserialize(file) as IAutomaton;
             }
         }
 
@@ -162,7 +158,7 @@ namespace Life.ViewModel
             if (dialog.ShowDialog() == true)
             {
                 using var file = dialog.OpenFile();
-                _formatter.Serialize(file, Field);
+                _formatter.Serialize(file, Automaton);
             }
         }
     }