diff --git a/OOP_3B5_Project/src/backend/Board.java b/OOP_3B5_Project/src/backend/Board.java
index 8cd21a7..9ce9c2b 100644
--- a/OOP_3B5_Project/src/backend/Board.java
+++ b/OOP_3B5_Project/src/backend/Board.java
@@ -1,6 +1,7 @@
 package backend;
 
 import java.util.ArrayList;
+import java.util.HashMap; // for unddolastmove
 
 public class Board {
 	private int column; // constructors for column and line 
@@ -11,7 +12,7 @@ public class Board {
 	private int selectX = -1;
 	private int selectY = -1;
 	private Move move;
-	private int zero = -1;
+	private HashMap<Integer, ArrayList<Piece>> boardHistory; // hashmap for undolastmove
 	
 	//initiation of the board, creating an 8 * 8 grid
 	public Board(int colNum, int lineNum) {
@@ -19,6 +20,7 @@ public class Board {
 		this.line = lineNum;
 		this.pieces = new ArrayList<>();
 		this.move = new Move(pieces, this); //adding an acces to Move methods and linkking the arraylist to the class methods
+		this.boardHistory = new HashMap<>(); //for history of the board an make undolastmove possible, acts like a dictionnary in python
 		
 	}
 
@@ -37,10 +39,6 @@ public class Board {
 	public void setTurnNb(int turnNb) {
 		this.turnNb = turnNb;
 	}
-	
-	public int getZero() {
-		return this.zero;
-	}
 
 	public boolean isTurnWhite() {
 		if (turnNb % 2 == 0){