Usually when a writer doesn't name a character, and especially the main protagonist, he is wanting the reader to identify with the character on a more personal level. The character becomes "every man"; someone who is everyone, anyone, and no one at the same time. This allows the reader to empathize with and share similar feelings and emotions all humans experience through the unnamed character. Using his technique allows the reader to see how he could make the same choices, decisions, and mistakes as the nameless protagonist in the same circumstances. By doing this, it encourages the reader to put himself in the character's "shoes", so to speak. The writer hopes you will become more engaged in the work and understand the character's purpose and motives. If the reader can identity with the obstacles and hardships experienced by the character, the writer has truly created a lasting and memorable work of art by making the reading of the work and the lessons the reader learns more personal.