diff --git a/fh.fd.ci.client/src/main/java/de/fd/fh/Figure.java b/fh.fd.ci.client/src/main/java/de/fd/fh/Figure.java
index 6f0f751..642ae9a 100644
--- a/fh.fd.ci.client/src/main/java/de/fd/fh/Figure.java
+++ b/fh.fd.ci.client/src/main/java/de/fd/fh/Figure.java
@@ -31,6 +31,11 @@ public class Figure
             return false;
         }
 
+        if (src / 8 - dst / 8 < 0 && src % 8 - dst % 8 < 0) // diagonal nach rechts unten
+        {
+            return false;
+        }
+
         return true;
     }
 }
diff --git a/fh.fd.ci.client/src/test/java/de/fd/fh/FigureTest.java b/fh.fd.ci.client/src/test/java/de/fd/fh/FigureTest.java
index 2406f7e..be95a20 100644
--- a/fh.fd.ci.client/src/test/java/de/fd/fh/FigureTest.java
+++ b/fh.fd.ci.client/src/test/java/de/fd/fh/FigureTest.java
@@ -69,4 +69,11 @@ class FigureTest
         Figure f = new Figure();
         assertFalse(f.moveAllowed(Figure.fieldLength * 4 + 4, Figure.fieldLength * 5 + 3, new int[Figure.fieldLength * Figure.fieldLength]));
     }
+
+    @Test
+    void whiteRookInvalidMoveRightDown() // diagonal nach rechts unten
+    {
+        Figure f = new Figure();
+        assertFalse(f.moveAllowed(36, 45, new int[8 * 8]));
+    }
 }
\ No newline at end of file