In warm water dissolve yeast, add sugar, salt, butter, baking powder and gradually flour. Knead the dough. Put in the fridge for an hour and a half. Put the dough in. Hold 15 min in the fridge. Form a loaf and put the dough in the form for an hour in the fridge. Put in preheated oven to 170*C to two hours. The finished bread should be easy to get out of shape. Grease the top crust with oil. Allow the bread to cool.