Nevermind, sorry - I've figured it out myself (for a change)

                delete from pref_scores where id<>_id and gid in
                    (select gid from pref_scores where id=_id);

                delete from pref_games where gid in
                    (select gid from pref_scores where id=_id);

                delete from pref_scores where id=_id;

Regards
Alex

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