(This April 26 story corrects context in fourth paragraph on natural gas) By Simon Bahceli NICOSIA (Reuters) - A leftist moderate promising to press for a peace deal in ethnically-split Cyprus swept to victory in a Turkish Cypriot presidential election runoff on Sunday. Mustafa Akinci, standing as an independent, won 60.3 percent of the votes, according to figures provided by the election commission. His rival was incumbent president Dervis Eroglu, a conservative elected five years ago. Akinci, 67, has said he would work with fresh urgency to find a peace deal on Cyprus, split in a 1974 Turkish invasion that was triggered by a short-lived Greek-inspired coup aimed at union with Greece.