Potato, Parmesan, And Anchovy Focaccia

• 500 gr all purpose flour up
• 425 gr potatoes scrubbed (red)
• 300 gr mashed potatoes
• 240 ml lukewarm water
• 90 ml olive oil
• 20 gr parmesan (freshly grated)
• 10 gr dry yeast (active)
• 6 gr table salt
• 3 gr rosemary leaves fine (fresh chopped)
• 2 gr sugar