Other checks are ‘soft checks’, for responses that seem unlikely (either because of other information provided or because they are outside the usual range) but could be correct.
Gwellodd hyn yr amcangyfrifon ychydig bach, gan eu bod o bosibl wedi cael eu cynnwys o dan “Cymwysterau eraill” neu eu gadael allan yn llwyr gan ymatebydd ynghynt.