diff --git a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
index a340ddd..1930005 100644
--- a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
+++ b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
@@ -8,15 +8,17 @@ namespace MiniGames.Shared.Models
 {
     public class TicTacToeBrett
     {
+        public const int LEER = -1;
+
         int[,] Felder;
 
         public TicTacToeBrett()
         {
             Felder = new[,]
             {
-                { -1, -1, -1 },
-                { -1, -1, -1 },
-                { -1, -1, -1 },
+                { LEER, LEER, LEER },
+                { LEER, LEER, LEER },
+                { LEER, LEER, LEER },
             };
         }
 
@@ -48,7 +50,7 @@ namespace MiniGames.Shared.Models
             
             try
             {
-                if (Felder[x, y] != -1)
+                if (Felder[x, y] != LEER)
                     return false;
             }
             catch (IndexOutOfRangeException e)
@@ -67,7 +69,7 @@ namespace MiniGames.Shared.Models
             {
                 for (int j = 0; j < 3; j++)
                 {
-                    if (Felder[i, j] == -1)
+                    if (Felder[i, j] == LEER)
                     {
                         return false;
                     }
diff --git a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
index 9b93890..27d8f31 100644
--- a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
+++ b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
@@ -6,9 +6,9 @@ namespace MiniGamesTests
     public class TicTacToeBrettTest
     {
         public TicTacToeBrett TestBrett(
-            int a = -1, int b = -1, int c = -1,
-            int d = -1, int e = -1, int f = -1,
-            int g = -1, int h = -1, int i = -1
+            int a = TicTacToeBrett.LEER, int b = TicTacToeBrett.LEER, int c = TicTacToeBrett.LEER,
+            int d = TicTacToeBrett.LEER, int e = TicTacToeBrett.LEER, int f = TicTacToeBrett.LEER,
+            int g = TicTacToeBrett.LEER, int h = TicTacToeBrett.LEER, int i = TicTacToeBrett.LEER
         )
         {
             return new(
@@ -26,7 +26,13 @@ namespace MiniGamesTests
         {
             // arrange
             TicTacToeBrett brett = new();
-            TicTacToeBrett erwartetesBrett = TestBrett(-1, -1, -1, -1, 0);
+            TicTacToeBrett erwartetesBrett = TestBrett(
+                TicTacToeBrett.LEER,
+                TicTacToeBrett.LEER,
+                TicTacToeBrett.LEER,
+                TicTacToeBrett.LEER,
+                0
+            );
             int pos = 4;
             int wert = 0;
             bool erwartetGesetzt = true;