Melbourne (Reuters) - Tabcorp Holdings Ltd, Australia's top gaming group, reported an annual net loss reflecting the loss of its Victorian slot machine duopoly and a surprise write down on the value of its wagering business. However it reported a flat profit before one-offs, slightly ahead of broker forecasts, and said it would hold its dividend steady, even though gamblers were tightening their belts in the face of higher interest rates, grocery and petrol bills.