What motivates Odysseus to tell a lie to the Cyclops?

Odysseus knows that Poseidon is the Cyclops' father.

Odysseus is afraid the Cyclops will steal their ship.

Odysseus does not want to reveal their only means of escape.

Odysseus does not know what has happened to his ship.

He lied to him because he knew that the Cyclops would call his brothers, when blinded, so he said his name was "nobody" so as to have the Cyclops yell out: "Nobody has blinded me". This in turn caused his brothers to not react at all, because they thought that gods had blinded his brother, therefore he is yelling that Nobody blinded him. Let's say then that the third sentence is the only one that can fit the story.