[bongodongobob]

Track the two clients pings? What client side cheating prevention would you need to do in chess? Afaik you can't cheat by clipping through walls or jumping around on the map.

[connicpu]

The client side cheating would by lying about when you received the packet in order to give yourself more time to think. Even if you only shifted it by 200ms per move, that could add up to a lot over the course of a long game.

[kaoD]

To give additional context: bullet chess can go down to 1 minute per player. Lying about a few millisecond per move there is huge.

[HDThoreaun]

Cheat by giving yourself more time