diff --git a/bin/uebung09/chess/Board.class b/bin/uebung09/chess/Board.class
index b8dbe64..8238078 100644
Binary files a/bin/uebung09/chess/Board.class and b/bin/uebung09/chess/Board.class differ
diff --git a/bin/uebung09/chess/ChessApp.class b/bin/uebung09/chess/ChessApp.class
index e0ba0af..caa1e54 100644
Binary files a/bin/uebung09/chess/ChessApp.class and b/bin/uebung09/chess/ChessApp.class differ
diff --git a/src/uebung09/chess/Board.java b/src/uebung09/chess/Board.java
index 1d8cfe1..21e9b87 100644
--- a/src/uebung09/chess/Board.java
+++ b/src/uebung09/chess/Board.java
@@ -4,10 +4,14 @@ import java.util.ArrayList;
 import java.util.List;
 import uebung09.iterator.Array2dIterator;
 
-public class Board extends Array2dIterator<Piece> {
+public class Board extends Array2dIterator<Piece>{
     private final Piece[][] field = new Piece[8][8];
     private final List<Piece> pieces = new ArrayList<>();
 
+    Board(){
+        
+    }
+
     void add(Piece piece) {
         if (piece.getBoard() != this)
             throw new IllegalArgumentException("wrong board");
diff --git a/src/uebung09/chess/ChessApp.java b/src/uebung09/chess/ChessApp.java
index 634d9f9..1fe9baa 100644
--- a/src/uebung09/chess/ChessApp.java
+++ b/src/uebung09/chess/ChessApp.java
@@ -12,6 +12,7 @@ public class ChessApp {
     private static final String BLACK_QUEEN = "Q";
     private static final String WHITE_KNIGHT = "n";
     private static final String BLACK_KNIGHT = "N";
+    private static final String ITERATOR = "i";
 
     private final Scanner scanner;
     private final Board board;