Does the Sixth Amendment's guarantee of effective assistance of counsel require an attorney to request a jury instruction on the sole statutory defense to prosecution when the defendant's undisputed factual account directly supports that defense, and the omission of such an instruction from the jury charge leaves the jury with no alternative but to convict on the charged offense?

Does the Sixth Amendment’s guarantee of effective assistance of counsel require an attorney to request a jury instruction on the sole statutory defense to prosecution when the defendant’s undisputed factual account directly supports that defense, and the omission of such an instruction from the jury charge leaves the jury with no alternative but to convict on the charged offense?