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?

Chess Ultra Trophies •

Chess Ultra Trophy Guide and Roadmap - Chess Ultra

hunteriscoolio's PSN Profile •

Games] Hey, I've spent a few hours creating a list of every PlayStation extra game (1-456) and I will give anybody a game to play from a random number generator. YOU MUST

Chess Ultra Trophy Guide •

Chess Ultra Trophies •

Chess Ultra Trophies •

Auto Chess Trophies •

Chess Gambit Trophies •

Chess Ultra Trophy Guide and Roadmap - Chess Ultra