PS+ Required? - Chess Ultra - PSNProfiles

Can anybody tell me if this game requires PlayStation Plus in order to unlock any of the online trophies (even the ones that can be boosted using multiple accounts) or can the platinum be achieved without it?

dgaustin's PSN Profile •

En Passant achievement in Chess Ultra

Download and play Chess Ultra: Pantheon Game Pack at the Epic Games Store.

Chess Ultra: Pantheon Game Pack

EiichiHoba's PSN Profile •

JeSuisVoldy's PSN Profile •

Chess Ultra Trophies •

Chess Ultra Trophies •

TheWhitePony's PSN Profile •

Chess Ultra Trophies ~ PSN 100%