diff --git a/67_One_Check/csharp/Board.cs b/67_One_Check/csharp/Board.cs
index 7ae917be..2e68072d 100644
--- a/67_One_Check/csharp/Board.cs
+++ b/67_One_Check/csharp/Board.cs
@@ -3,7 +3,8 @@ namespace OneCheck;
 internal class Board
 {
     private readonly bool[][] _checkers;
-    private int _count;
+    private int _pieceCount;
+    private int _moveCount;
 
     public Board()
     {
@@ -12,16 +13,33 @@ internal class Board
                 .Select(r => Enumerable.Range(0, 8)
                     .Select(c => r <= 1 || r >= 6 || c <= 1 || c >= 6).ToArray())
                 .ToArray();
-        _count = 48;
+        _pieceCount = 48;
     }
 
     private bool this[int index]
     {
-        get => _checkers[(index - 1) / 8][(index-1) % 8];
-        set => _checkers[(index - 1) / 8][(index-1) % 8] = value;
+        get => _checkers[index / 8][index % 8];
+        set => _checkers[index / 8][index % 8] = value;
     }
 
-    public int Count => _count;
+    public bool PlayMove(IReadWrite io)
+    {
+        while (true)
+        {
+            var from = (int)io.ReadNumber(Prompts.From);
+            if (from == 0) { return false; }
+
+            var move = new Move { From = from - 1, To = (int)io.ReadNumber(Prompts.To) - 1 };
+
+            if (TryMove(move)) 
+            { 
+                _moveCount++;
+                return true; 
+            }
+
+            io.Write(Streams.IllegalMove);
+        }
+    }
 
     public bool TryMove(Move move)
     {
@@ -30,7 +48,7 @@ internal class Board
             this[move.From] = false;
             this[move.Jumped] = false;
             this[move.To] = true;
-            _count--;
+            _pieceCount--;
             return true;
         }
 
@@ -39,6 +57,8 @@ internal class Board
 
     private bool IsPieceJumpingPieceToEmptySpace(Move move) => this[move.From] && this[move.Jumped] && !this[move.To];
 
+    public string GetReport() => string.Format(Formats.Results, _moveCount, _pieceCount);
+
     public override string ToString() => 
         string.Join(Environment.NewLine, _checkers.Select(r => string.Join(" ", r.Select(c => c ? " 1" : " 0"))));
 }
diff --git a/67_One_Check/csharp/Game.cs b/67_One_Check/csharp/Game.cs
index 49da9851..d9e64e26 100644
--- a/67_One_Check/csharp/Game.cs
+++ b/67_One_Check/csharp/Game.cs
@@ -3,13 +3,10 @@ namespace OneCheck;
 internal class Game
 {
     private readonly IReadWrite _io;
-    private readonly Board _board;
-    private int _moveCount;
 
     public Game(IReadWrite io)
     {
         _io = io;
-        _board = new Board();
     }
 
     public void Play()
@@ -18,29 +15,31 @@ internal class Game
         
         do
         {
-            _io.WriteLine(_board);
-            _io.WriteLine();
-        } while (PlayMove());
+            var board = new Board();
+            do
+            {
+                _io.WriteLine(board);
+                _io.WriteLine();
+            } while (board.PlayMove(_io));
 
-        _io.WriteLine(Formats.Results, _moveCount, _board.Count);
+            _io.WriteLine(board.GetReport());
+        } while (_io.ReadYesNo(Prompts.TryAgain) == "yes");
+
+        _io.Write(Streams.Bye);
     }
+}
 
-    private bool PlayMove()
+internal static class IOExtensions
+{
+    internal static string ReadYesNo(this IReadWrite io, string prompt)
     {
         while (true)
         {
-            var from = (int)_io.ReadNumber(Prompts.From);
-            if (from == 0) { return false; }
+            var response = io.ReadString(prompt).ToLower();
 
-            var move = new Move { From = from, To = (int)_io.ReadNumber(Prompts.To) };
+            if (response == "yes" || response == "no") { return response; }
 
-            if (_board.TryMove(move)) 
-            { 
-                _moveCount++;
-                return true; 
-            }
-
-            _io.Write(Streams.IllegalMove);
+            io.Write(Streams.YesOrNo);
         }
     }
 }
diff --git a/67_One_Check/csharp/Move.cs b/67_One_Check/csharp/Move.cs
index b90f7c0b..0b48659e 100644
--- a/67_One_Check/csharp/Move.cs
+++ b/67_One_Check/csharp/Move.cs
@@ -6,7 +6,7 @@ internal class Move
     public int To { get; init; }
     public int Jumped => (From + To) / 2;
 
-    public bool IsInRange => From >= 1 && From <= 64 && To >= 1 && To <= 64;
+    public bool IsInRange => From >= 0 && From <= 63 && To >= 0 && To <= 63;
     public bool IsTwoSpacesDiagonally => RowDelta == 2 && ColumnDelta == 2;
     private int RowDelta => Math.Abs(From / 8 - To / 8);
     private int ColumnDelta => Math.Abs(From % 8 - To % 8);
diff --git a/67_One_Check/csharp/Resources/Results.txt b/67_One_Check/csharp/Resources/Results.txt
index 8d4bd13f..a8771b6b 100644
--- a/67_One_Check/csharp/Resources/Results.txt
+++ b/67_One_Check/csharp/Resources/Results.txt
@@ -1,4 +1,3 @@
 
 You made {0} jumps and had {1} pieces
 remaining on the board.
-