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T9 sy’n ymchwilio i bryderon bod system beirniadu Eisteddfod yr Urdd yn arwain at anhegwch ac yn tanseilio’r cystadlu. A bydd y rhaglen hefyd yn dateglu bod y cythraul canu wedi mynd rhy bell – gan arwain at ymchwiliad heddlu ar ol i lythyrau sinistr di-enw gael eu gyrru at feirniaid eisteddfodol. T9 investigates concerns that the judging system for the Urdd Eisteddfod leads to unfairness and undermines the competition. The programme also discloses that the friction of competitiveness has gone too far – leading to a police investigation into sinister anonymous letters sent to eisteddfod judges.