Irelia vs Gwen

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.

To hit her during Hallowed Mist (W), walk into the mist or wait for it to fade: from outside, you can't target her.

Take short trades before she lands 4 autos: each one adds a snip to Snip Snip! (Q).

Step out of the Needlework (R) line: she can recast it twice within 6 seconds, with three then five needles.

Answer her split push with two players rather than alone: A Thousand Cuts (passive) heals her on every auto against a champion.