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

Auto Chess Trophy Guides and PSN Price History

Chess Ultra: Academy Game Pack

Chess Ultra: Academy Game Pack

Chess Ultra: Academy Game Pack

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Chess Ultra Trophy Guide & Road Map