If 3 Opp parties are contesting in the same GRC, it risks splitting of votes and reducing winning chance.
However, even if only one Opp party contests, there may still be vote splitting among those who vote PAP, those who vote the Opp, and those who cast protest votes because they dislike either.
Nevertheless, it will be good if we do not let any GRC or single ward go uncontested. That way, the PAP if they win, will walk away with a thin margin, and broken egos for the Old fart and his lackeys.