diff --git a/src/backend/Board.java b/src/backend/Board.java
index 1da9ee8..06bd0ae 100644
--- a/src/backend/Board.java
+++ b/src/backend/Board.java
@@ -400,7 +400,19 @@ public class Board {
 	}
 
 	public Board(Board board) {
-		//TODO
+		//copy the board size
+				this.col = board.col; //number of column
+				this.line = board.line; //number of row
+				this.turnNumber = board.turnNumber;
+				this.turnWhite = board.turnWhite;
+				//copy the selected positions
+				this.selectedPosition = board.selectedPosition == null ? null:
+					new int[] {board.selectedPosition[0], board.selectedPosition[1]};
+				//Deep copy highlighted positions
+				this.highlightedPositions = new ArrayList<>();
+				for (int[] pos : highlightedPositions) {
+				
+				}
 
 	}