diff --git a/src/main/java/de/tims/tictactoe/GameLogic.java b/src/main/java/de/tims/tictactoe/GameLogic.java
index 6fed5b6..ffaa984 100644
--- a/src/main/java/de/tims/tictactoe/GameLogic.java
+++ b/src/main/java/de/tims/tictactoe/GameLogic.java
@@ -64,6 +64,13 @@ public class GameLogic {
 			countFields = 0;
 		}
 		
+		// check diagonal left
+        for (int i = this.board.length - 1, j = this.board.length - 1; i >= 0 ; i--, j--) {
+            if (board[i][j] == player) countFields++;
+        }
+        if(countFields == this.board.length) return finished = true;
+
+		
 		return finished;
 	}
 
diff --git a/src/test/java/de/tims/tictactoe/GameLogicTest.java b/src/test/java/de/tims/tictactoe/GameLogicTest.java
index 30ab928..216e02c 100644
--- a/src/test/java/de/tims/tictactoe/GameLogicTest.java
+++ b/src/test/java/de/tims/tictactoe/GameLogicTest.java
@@ -196,13 +196,17 @@ class GameLogicTest {
 																						  {'-', '-', '-'}}),
 		    			Arguments.of("check a draw for player 2", 'o', false, new char[][] 
 																				 {{'o', 'o', 'x'}, 
-																				  {'o', 'o', 'x'},
+																				  {'o', 'x', 'x'},
 																				  {'x', 'x', 'o'}}),
 		    			Arguments.of("check a draw for player 1", 'x', false, new char[][] 
 																				 {{'o', 'o', 'x'}, 
 																				  {'o', 'o', 'x'},
-																				  {'x', 'x', 'o'}})
-			    		);
+																				  {'x', 'x', 'o'}}),
+		    			Arguments.of("check diagonal left win for player 1", 'x', true, new char[][] 
+																				 {{'x', 'o', 'x'}, 
+																				  {'x', 'x', 'o'},
+																				  {'o', 'o', 'x'}})
+		    		);
 	 }
 		
 }