Irelia vs Tryndamere

Mark your targets with Flawless Duet (E) or Vanguard's Edge (R) before Bladesurge (Q): if the target is Unsteady or dies to it, its cooldown resets.

Before a trade, hit minions with Bladesurge (Q) to stack Ionian Fervor (passive): each stack gives attack speed, and at max stacks your autos hit harder.

Place the two blades of Flawless Duet (E) on either side of your target: only enemies caught between them are stunned.

Use Defiant Dance (W) to absorb a burst: you take less damage while charging, and the longer you hold it, the harder the release hits.

Avoid taking a trade when his Fury is high: with Battle Fury (passive), it raises his critical strike chance, and Bloodlust (Q) turns it into healing.

Hit him when he walks up to minions to farm: each last hit gives him Fury, which Bloodlust (Q) then turns into healing.

Against Mocking Shout (W), back off sideways rather than turning your back on him: the spell only slows enemies who are facing away from him.

Once he hits level 6, plan for what comes after Undying Rage (R): he can't die during the effect, so back off or hold any CC you have, and finish him when it ends.