diff --git a/schach/pom.xml b/schach/pom.xml
index ab9e214..7e08e04 100644
--- a/schach/pom.xml
+++ b/schach/pom.xml
@@ -10,13 +10,12 @@
   <version>0.0.1-SNAPSHOT</version>
 
   <name>schach</name>
-  <description>A simple schach.</description>
+  <description>A simple schach project</description>
   <url>http://www.example.com</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>21</maven.compiler.source>
-    <maven.compiler.target>21</maven.compiler.target>
+    <maven.compiler.release>21</maven.compiler.release>
   </properties>
 
   <repositories>
@@ -27,19 +26,22 @@
   </repositories>
 
   <dependencies>
-    <!-- Schachlib (bhlangonijr) -->
+    <!-- Schachlib -->
     <dependency>
       <groupId>com.github.bhlangonijr</groupId>
       <artifactId>chesslib</artifactId>
       <version>1.3.4</version>
     </dependency>
+
+    <!-- JUnit 5 -->
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter</artifactId>
       <version>5.10.2</version>
       <scope>test</scope>
     </dependency>
-    <!-- Mockito damit man Controller und Gui besser testen kann-->
+
+    <!-- Mockito -->
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
@@ -50,14 +52,32 @@
 
   <build>
     <plugins>
+      <!-- Java Compiler Plugin -->
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.13.0</version>
+        <configuration>
+          <release>21</release>
+        </configuration>
+      </plugin>
+
       <!-- PMD Plugin -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-pmd-plugin</artifactId>
         <version>3.21.0</version>
         <configuration>
+          <!-- Set to 17 until PMD supports 21 -->
+          <targetJdk>17</targetJdk>
+          <failOnViolation>false</failOnViolation>
+          <printFailingErrors>true</printFailingErrors>
+          <linkXRef>false</linkXRef>
           <rulesets>
             <ruleset>rulesets/java/quickstart.xml</ruleset>
+            <ruleset>rulesets/java/basic.xml</ruleset>
+            <ruleset>rulesets/java/braces.xml</ruleset>
+            <ruleset>rulesets/java/unusedcode.xml</ruleset>
+            <ruleset>rulesets/java/imports.xml</ruleset>
           </rulesets>
         </configuration>
         <executions>
@@ -69,43 +89,12 @@
           </execution>
         </executions>
       </plugin>
-      <!-- Weitere Standard-Plugins -->
-      <plugin>
-        <artifactId>maven-clean-plugin</artifactId>
-        <version>3.4.0</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-site-plugin</artifactId>
-        <version>3.12.1</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-project-info-reports-plugin</artifactId>
-        <version>3.6.1</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-resources-plugin</artifactId>
-        <version>3.3.1</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.13.0</version>
-      </plugin>
+
+      <!-- Surefire Plugin for tests -->
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <version>3.3.0</version>
       </plugin>
-      <plugin>
-        <artifactId>maven-jar-plugin</artifactId>
-        <version>3.4.2</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-install-plugin</artifactId>
-        <version>3.1.2</version>
-      </plugin>
-      <plugin>
-        <artifactId>maven-deploy-plugin</artifactId>
-        <version>3.1.2</version>
-      </plugin>
     </plugins>
   </build>
 
@@ -113,6 +102,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-project-info-reports-plugin</artifactId>
+        <version>3.6.1</version>
       </plugin>
     </plugins>
   </reporting>
diff --git a/schach/src/main/java/de/hs_mannheim/informatik/chess/controller/GameController.java b/schach/src/main/java/de/hs_mannheim/informatik/chess/controller/GameController.java
index a30cccd..aa6d73f 100644
--- a/schach/src/main/java/de/hs_mannheim/informatik/chess/controller/GameController.java
+++ b/schach/src/main/java/de/hs_mannheim/informatik/chess/controller/GameController.java
@@ -25,7 +25,8 @@ public class GameController {
     GameEndCallback callback;
     
     private boolean gameOver = false;
-    private int selectedRow = -1, selectedCol = -1;
+    private int selectedRow = -1;
+    private int selectedCol = -1;
     private List<int[]> highlightedFields = new ArrayList<>();
     private boolean gameWasResignedOrDrawn = false;
     private GameMode gameMode;