refactor

src/uebung09/chess/Board.java

@@ -1,9 +1,10 @@
-package chess;
+package uebung09.chess;
 
 import java.util.ArrayList;
 import java.util.List;
+import uebung09.iterator.Array2dIterator;
 
-public class Board {
+public class Board extends Array2dIterator<Piece> {
     private final Piece[][] field = new Piece[8][8];
     private final List<Piece> pieces = new ArrayList<>();