diff --git a/67_One_Check/csharp/Board.cs b/67_One_Check/csharp/Board.cs
new file mode 100644
index 00000000..213a54d7
--- /dev/null
+++ b/67_One_Check/csharp/Board.cs
@@ -0,0 +1,18 @@
+namespace OneCheck;
+
+internal class Board
+{
+    private readonly int[][] _checkers;
+
+    public Board()
+    {
+        _checkers = 
+            Enumerable.Range(0, 8)
+                .Select(r => Enumerable.Range(0, 8)
+                    .Select(c => r > 1 && r < 6 && c > 1 && c < 6 ? 0 : 1).ToArray())
+                .ToArray();
+    }
+
+    public override string ToString() => 
+        string.Join(Environment.NewLine, _checkers.Select(r => string.Join(" ", r.Select(c => $" {c}"))));
+}
\ No newline at end of file
diff --git a/67_One_Check/csharp/Game.cs b/67_One_Check/csharp/Game.cs
new file mode 100644
index 00000000..924fc04c
--- /dev/null
+++ b/67_One_Check/csharp/Game.cs
@@ -0,0 +1,20 @@
+namespace OneCheck;
+
+internal class Game
+{
+    private readonly IReadWrite _io;
+    private readonly Board _board;
+
+    public Game(IReadWrite io)
+    {
+        _io = io;
+        _board = new Board();
+    }
+
+    public void Play()
+    {
+        _io.Write(Streams.Introduction);
+        
+        _io.WriteLine(_board);
+    }
+}
diff --git a/67_One_Check/csharp/Program.cs b/67_One_Check/csharp/Program.cs
new file mode 100644
index 00000000..4a3ab83b
--- /dev/null
+++ b/67_One_Check/csharp/Program.cs
@@ -0,0 +1,5 @@
+global using Games.Common.IO;
+global using static OneCheck.Resources.Resource;
+using OneCheck;
+
+new Game(new ConsoleIO()).Play();
diff --git a/67_One_Check/csharp/Resources/Introduction.txt b/67_One_Check/csharp/Resources/Introduction.txt
index bc891a6e..409f6b37 100644
--- a/67_One_Check/csharp/Resources/Introduction.txt
+++ b/67_One_Check/csharp/Resources/Introduction.txt
@@ -17,13 +17,14 @@ question 'Jump from ?'
 
 Here is the numerical board:
 
-1   2   3   4   5   6   7   8
-9   10  11  12  13  14  15  16
-17  18  19  20  21  22  23  24
-25  26  27  28  29  30  31  32
-33  34  35  36  37  38  39  40
-41  42  43  44  45  46  47  48
-49  50  51  52  53  54  55  56
-57  58  59  60  61  62  63  64
+ 1   2   3   4   5   6   7   8
+ 9   10  11  12  13  14  15  16
+ 17  18  19  20  21  22  23  24
+ 25  26  27  28  29  30  31  32
+ 33  34  35  36  37  38  39  40
+ 41  42  43  44  45  46  47  48
+ 49  50  51  52  53  54  55  56
+ 57  58  59  60  61  62  63  64
 
 And here is the opening position of the checkers.
+