Prioritize extended melee fights inside (W) to leverage Trundle's healing and attack speed against Cho'Gath's tankiness.
Maintain medium lane pressure to deny Cho'Gath a passive farming lane and prevent him from stacking (R).
This is a splitpush versus scaling matchup; focus on punishing Cho'Gath's low early agency and preventing his late durability.
Trading pattern
Use (Q) to steal attack damage and weaken Cho'Gath's damage output during trades.
Engage in long trades inside (W) to maximize healing and attack speed, then use (E) to trap or slow Cho'Gath and prevent his disengage.
Punish Cho'Gath when (W) silence or (Q) knockup are on cooldown by extending trades or forcing fights.
Danger windows
Be cautious when Cho'Gath has (Q) and (W) available, as his knockup and silence can disrupt trades or escapes.
Avoid fighting Cho'Gath when his (R) execute is up on low-health targets to prevent sudden deaths.
Watch for gank setups using your (E) pillar; misuse can leave you vulnerable to counter-engages.
Early game
Pressure Cho'Gath early by forcing trades inside (W) to exploit his low early agency and lack of burst.
Avoid prolonged fights before level 6 where Cho'Gath's passive sustain and silence can punish you.
Use (E) to cut off Cho'Gath's escape or chase paths after he commits to last-hitting near minions.
Power spikes
At level 6, use (R) on Cho'Gath to drain his health and resistances before committing to extended duels.
First dueling item spike strengthens extended fights and tower pressure; force side-lane trades inside (W) to capitalize.
Respect Cho'Gath's level 6 (R) execute power; avoid low-health all-ins and punish cooldowns before he stacks durability.
Win conditions
Force extended melee duels inside (W) to out-sustain and out-trade Cho'Gath, denying him safe scaling.
Use (E) pillar to trap Cho'Gath or block his escape routes, enabling kills or forcing summoner spells.
After securing (R) and first item, pressure side lanes to take towers and splitpush, leveraging your anti-tank strength and denying Cho'Gath teamfight impact.
Tip: For Trundle vs Cho'Gath, read overview, trading pattern, and danger windows first for a fast Top lane check.