Making up for a slow start, a determined R. Praggnanandhaa won all five rounds on Friday to share the lead after 10 rounds of Gelfand Challenge online rapid chess tournament. He went on to account for Zhu Jiner, teammate Leon Mendonca, Vincent Keymer and Jonas Buhl Bjerre for a share of the lead with top seeded Uzbek Nodirbek Abdusattarov at …