diff --git a/Main.java b/Main.java
index db30672..b695b09 100644
--- a/Main.java
+++ b/Main.java
@@ -11,7 +11,7 @@ public class Main {
     // Threshold of number of mutable positions for easy level sudoku
     public static int EASYTHRESHOLD = 60; 
     public static int HARDTHRESHOLD = 70;
-    // List to store the population of chromosomes
+    // List to store the population of chromosomes  
     List<Chromosome> population = new ArrayList<>();
     Random random = new Random();
 
@@ -58,9 +58,9 @@ public class Main {
             MUTATIONRATE = 0.057;
         }
         else { // Ultra-hard sudoku
-            POPULATIONSIZE = 2000;
-            TOURNAMENTSIZE = 10;
-            MUTATIONRATE = 0.2;
+            POPULATIONSIZE = 20000;
+            TOURNAMENTSIZE = 4;
+            MUTATIONRATE = 0.032;
         }
         
         // Generate initial population of 100 chromosomes
diff --git a/statistical/demo/src/main/java/com/example/Main.java b/statistical/demo/src/main/java/com/example/Main.java
index 528516d..4258789 100644
--- a/statistical/demo/src/main/java/com/example/Main.java
+++ b/statistical/demo/src/main/java/com/example/Main.java
@@ -63,9 +63,9 @@ public class Main {
             MUTATIONRATE = 0.055;
         }
         else { // Ultra-hard sudoku
-            POPULATIONSIZE = 2000;
-            TOURNAMENTSIZE = 10;
-            MUTATIONRATE = 0.2;
+            POPULATIONSIZE = 20000;
+            TOURNAMENTSIZE = 4;
+            MUTATIONRATE = 0.032;
         }
         
         // Generate initial population of chromosomes
@@ -106,7 +106,7 @@ public class Main {
             generation++;
 
             // Plot the fitness graph every 10 generations
-            if (generation % 10 == 0) {
+            if (generation % 100 == 0) {
                 mainInstance.plotFitness(fitnessValues);
             }
 
diff --git a/statistical/demo/target/classes/com/example/Main.class b/statistical/demo/target/classes/com/example/Main.class
index d7163d2..27b60fa 100644
Binary files a/statistical/demo/target/classes/com/example/Main.class and b/statistical/demo/target/classes/com/example/Main.class differ