diff --git a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
index 4fe20d0..13a9c46 100644
--- a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
+++ b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
@@ -105,6 +105,11 @@ namespace MiniGames.Shared.Models
                 return Felder[0, 0];
             }
 
+            if (dreiGleichGefuellt(Felder[2, 0], Felder[1, 1], Felder[0, 2]))
+            {
+                return Felder[2, 0];
+            }
+
             return LEER;
         }
     }
diff --git a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
index 9351135..b2d3422 100644
--- a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
+++ b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
@@ -318,5 +318,24 @@ namespace MiniGamesTests
             // assert
             Assert.Equal(erwarteterGewinner, erhaltenerGewinner);
         }
+
+
+        [Fact]
+        public void Gewinner_DiagonaleReiheNOzuSW()
+        {
+            // arrange
+            TicTacToeBrett brett = TestBrett(
+                TicTacToeBrett.LEER, TicTacToeBrett.LEER, 6,
+                TicTacToeBrett.LEER, 6, TicTacToeBrett.LEER,
+                6, TicTacToeBrett.LEER, TicTacToeBrett.LEER
+            );
+            int erwarteterGewinner = 6;
+
+            // act
+            int erhaltenerGewinner = brett.Gewinner();
+
+            // assert
+            Assert.Equal(erwarteterGewinner, erhaltenerGewinner);
+        }
     }
 }