Untitled

 public virtual void Update()
        {
            mouseState = Mouse.GetState();
            if (mouseState.LeftButton == ButtonState.Pressed)
            {
                if (dragging)
                    position = new Vector2(mouseState.X, mouseState.Y); // il pezzo si muove seguendo il mouse

                else if (IsMouseIn)
                    dragging = true;
            }

            else if (dragging)
            {
                dragging = false;

                int squareCenter = (int)board.SquareSize / 2;

                Point casella = new Point((int)(position.X / board.SquareSize), (int)(position.Y / board.SquareSize));
                position = new Vector2(casella.X * board.SquareSize + squareCenter, casella.Y * board.SquareSize + squareCenter);
            }