diff --git a/ChineseChess.Core/ChessboardPosition.cs b/ChineseChess.Core/ChessboardPosition.cs
index 616b848..1be8be5 100644
--- a/ChineseChess.Core/ChessboardPosition.cs
+++ b/ChineseChess.Core/ChessboardPosition.cs
@@ -2,7 +2,52 @@
 {
     public struct ChessboardPosition
     {
-        public byte Col;
-        public byte Row;
+        public int Col;
+        public int Row;
+
+        public ChessboardPosition(int col, int row)
+        {
+            Col=col;
+            Row=row;
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is ChessboardPosition pos 
+                && pos.Col == this.Col 
+                && pos.Row == this.Row;
+        }
+
+        public override int GetHashCode()
+        {
+            return Col ^ Row;
+        }
+
+        public override string ToString()
+        {
+            return $"({Row}, {Col})";
+        }
+
+        public static bool operator ==(ChessboardPosition left, ChessboardPosition right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(ChessboardPosition left, ChessboardPosition right)
+        {
+            return !(left==right);
+        }
+
+        public static ChessboardPosition operator +(ChessboardPosition left, ChessboardPosition right)
+        {
+            return new ChessboardPosition(left.Col + right.Col, left.Row + right.Row);
+        }
+
+        public static ChessboardPosition operator -(ChessboardPosition left, ChessboardPosition right)
+        {
+            return new ChessboardPosition(left.Col - right.Col, left.Row - right.Row);
+        }
+
+
     }
 }
\ No newline at end of file