You attack Itachi, but Itachi Uchiha—intelligence gleaming in his eyes—dodged every attack, with effortless grace.

You manage to catch him off guard, thinking he’s done for.

Itachi: “Am I? Before you do anything, you should take a good look at yourself.”

Chills…

You blink as you are quickly trapped/killed by your own attack… Wait huh? But when did he… wtf?? Was this always a genjutsu?? Is this even the real Itachi.. Damn he’s good… too good...

Itachi: “You are already under my genjutsu” kunai at your throat

[Narrator: Right from the beginning… when you saw Itachi’s Sharingan, you were already under his genjutsu then. His skill & prowess with genjutsu is stupidly broken. He tricked you thinking you’ve won. You can’t beat this Genjutsu God. He even has a type of genjutsu to trigger in case of his death.]

[Intelligence: Extraordinary Genius Itachi was an outstanding genius with prodigious talent.]

A marvelous tactician. His ability to formulate & carry out short & long term strategies to absolute perfection is nearly unmatched. His ability to anticipate the actions of others & the outcomes of certain events is so accurate that it’s literally actual foresight.

He truly thought of every single possibility, & had contingencies for all of them, even after his death

Itachi's genius level intellect & brilliant strategic mind carry over to combat as well. His style revolves around calmly analyzing his opponent(s) & the situation he's in. Based on his careful & thorough, albeit extremely swift, analysis, he's able to derive a plethora of useful information including, his opponent's motivations, goals, moves, abilities, weaknesses, methods of countering their abilities in the most efficient way possible.

Itachi is adept at coming up with and using other unorthodox techniques to catch his opponent off guard…

Itachi: “You have already lost this fight”

[His Infinite-IQ-Genjutsu™-brain is elaborate. Genjutsu within multiple genjutsu. Checkmate GG]