diff --git a/Yujie AI/Yujie AI.iml b/Yujie AI/Yujie AI.iml
deleted file mode 100644
index c90834f..0000000
--- a/Yujie AI/Yujie AI.iml	
+++ /dev/null
@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
-    <exclude-output />
-    <content url="file://$MODULE_DIR$">
-      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
-    </content>
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
\ No newline at end of file
diff --git a/Yujie AI/src/Board.java b/Yujie AI/src/Board.java
deleted file mode 100644
index 63afacf..0000000
--- a/Yujie AI/src/Board.java	
+++ /dev/null
@@ -1,18 +0,0 @@
-public class Board {
-    public getAllLegalMoves(){
-
-    }
-    public makeMove(){
-
-    }
-
-    public undoMove(){
-
-    }
-
-    public isGameover(){
-
-    }
-
-    public
-}
diff --git a/Yujie AI/src/ChessAI.java b/Yujie AI/src/ChessAI.java
deleted file mode 100644
index 7000e97..0000000
--- a/Yujie AI/src/ChessAI.java	
+++ /dev/null
@@ -1,67 +0,0 @@
-public class ChessAI {
-    private final int MAX_DEPTH = 4;
-
-    public Move findBestMove(Board board) {
-        int bestScore = Integer.MIN_VALUE;
-        Move bestMove = null;
-
-        for (Move move : board.getAllLegalMoves()) {
-            board.makeMove(move);
-            int score = minimax(board, MAX_DEPTH, Integer.MIN_VALUE, Integer.MAX_VALUE, false);
-            board.undoMove();
-
-            if (score > bestScore) {
-                bestScore = score;
-                bestMove = move;
-            }
-        }
-
-        return bestMove;
-    }
-
-    private int minimax(Board board, int depth, int alpha, int beta, boolean maximizingPlayer) {
-        if (depth == 0 || board.isGameOver()) {
-            return evaluateBoard(board);
-        }
-
-        int score;
-        if (maximizingPlayer) {
-            score = Integer.MIN_VALUE;
-            for (Move move : board.getAllLegalMoves()) {
-                board.makeMove(move);
-                score = Math.max(score, minimax(board, depth - 1, alpha, beta, false));
-                board.undoMove();
-                alpha = Math.max(alpha, score);
-                if (beta <= alpha) {
-                    break;
-                }
-            }
-        } else {
-            score = Integer.MAX_VALUE;
-            for (Move move : board.getAllLegalMoves()) {
-                board.makeMove(move);
-                score = Math.min(score, minimax(board, depth - 1, alpha, beta, true));
-                board.undoMove();
-                beta = Math.min(beta, score);
-                if (beta <= alpha) {
-                    break;
-                }
-            }
-        }
-
-        return score;
-    }
-
-    private int evaluateBoard(Board board) {
-        int score = 0;
-        for (Piece piece : board.getPieces()) {
-            if (piece.getColor() == Color.WHITE) {
-                score += piece.getValue();
-            } else {
-                score -= piece.getValue();
-            }
-        }
-        return score;
-    }
-}
-
diff --git a/Yujie AI/src/Color.java b/Yujie AI/src/Color.java
deleted file mode 100644
index 43f7623..0000000
--- a/Yujie AI/src/Color.java	
+++ /dev/null
@@ -1,2 +0,0 @@
-public class Color {
-}
diff --git a/Yujie AI/src/Move.java b/Yujie AI/src/Move.java
deleted file mode 100644
index 1bc888e..0000000
--- a/Yujie AI/src/Move.java	
+++ /dev/null
@@ -1,2 +0,0 @@
-public class Move {
-}
diff --git a/Yujie AI/src/Piece.java b/Yujie AI/src/Piece.java
deleted file mode 100644
index 91ec34b..0000000
--- a/Yujie AI/src/Piece.java	
+++ /dev/null
@@ -1,2 +0,0 @@
-public class Piece {
-}
diff --git a/src/Board.java b/src/Board.java
index c76e1da..f228800 100644
--- a/src/Board.java
+++ b/src/Board.java
@@ -42,7 +42,7 @@ public class Board {
         for (int y = 0; y < 2; y++)
             for (int x = 0; x < BOARD_SIZE; x++) {
                 set(x, y, new Piece(true));
-                set(x, y + BOARD_SIZE - 2, new Piece(false));
+                set(x, y + 6, new Piece(false));
             }
     }
 
diff --git a/src/Main.java b/src/Main.java
index 7c17f30..eda4b4b 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -1,6 +1,8 @@
 import java.awt.*;
 
 public class Main {
+    static int TILE_SIZE = 64;
+
     public static void main(String[] args) {
         Board board = new Board();
         board.draw();