diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5af9c98..2928d94 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,5 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_X" default="true" project-jdk-name="openjdk-22" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/part5/aufg1.java b/src/part5/aufg1.java
index f6bdace..bafa787 100644
--- a/src/part5/aufg1.java
+++ b/src/part5/aufg1.java
@@ -21,12 +21,12 @@ public class aufg1 {
             result = 0;
         } else if (number < 2) {
             result =  1;
-        }else if (number == 10) {   // Optimization1
-            result =  89;
-        }else if (number == 20) {   // Optimization2
-            result =  10946;
-        }else if (number == 30) {   // Optimization3
-            result =  1346269;
+//        }else if (number == 10) {   // Optimization1
+//            result =  89;
+//        }else if (number == 20) {   // Optimization2
+//            result =  10946;
+//        }else if (number == 30) {   // Optimization3
+//            result =  1346269;
         }else {
             result =  fibonacciRec(number-1) + fibonacciRec(number-2);
         }
@@ -34,11 +34,30 @@ public class aufg1 {
         return result;
     }
 
+    public static int fiboTailRec(int number){
+        return helper(++number, new int[] {0,1});
+    }
+
+    private static int helper(int number, int[] result){
+        if (number < 0){
+            return 0;
+        }
+        if (number < 2){
+            return result[number];
+        }
+
+        int temp = result[0] + result[1];
+        result = new int[] {result[1], temp};
+
+        return helper(number-1, result);
+    }
+
     public static void main(String[] agrs){
         // Fib(47) causes an Integer Overflow
         for (int i=0; i<46; i++) {
             System.out.println("i " + i + ": " + fibonacciIter(i));
             System.out.println("i " + i + ": " + fibonacciRec(i));
+            System.out.println("i " + i + ": " + fiboTailRec(i));
             System.out.println("==========");
         }
     }
diff --git a/src/part5/aufg2/Demo.java b/src/part5/aufg2/Demo.java
index 6c28947..b74172b 100644
--- a/src/part5/aufg2/Demo.java
+++ b/src/part5/aufg2/Demo.java
@@ -4,9 +4,9 @@ public class Demo {
     public static void main(String[] args) {
         Queenproblem Q = new Queenproblem();
         Q.solve();
-//        System.out.println("========\n");
-//        Q.setField(new int[]{0,0,0,0,0,0,0,0});
-//        Q.solve();
+        System.out.println("====================================\n");
+        Q.setField(new int[]{0,0,0,0,0,0,0,0});
+        Q.solve();
     }
 }