Cho'Gath vs Yorick

Aim Rupture (Q) where your opponent is going, not where they are: the area knocks them into the air and slows them.

Follow a successful Rupture (Q) with Feral Scream (W): the silence stops them from casting spells, dashes included.

Cast Vorpal Spikes (E) before a trade: your next 3 autos launch spikes that slow enemies in front of you and deal damage based on their max health.

Finish with Feast (R) as soon as it's up: each kill gives you permanent max health, but minions and non-epic monsters only give a limited amount.

Dodge Mourning Mist (E): once marked, you lose armor, his nearby graves keep raising Mist Walkers, and his units rush toward you.

Kill his Mist Walkers, summoned by Shepherd of Souls (passive), before going for him: a single auto or single-target spell is enough for each.

If Dark Procession (W) traps you, hit the wall to break it instead of waiting for it to disappear.

If you can, take down the Maiden of the Mist before Yorick: summoned by Eulogy of the Isles (R), she carries a large part of his damage and push.

Don't let him split push alone: with the Eulogy of the Isles (R) Maiden and his Mist Walkers, he quickly threatens a tower. Send someone to answer him.