The leading group in the open section of the Chess Olympiad was reduced to eight teams after round four, with China, Uzbekistan, Germany and Armenia still unbeaten on every individual board. Lithuania supplied the main surprise of the day by beating Croatia 3–1. With all eight co-leaders now paired against one another, Sunday's fifth round is set to reshape the top of the standings. | Pictured: China's Wei Yi | Photo: Michal Walusza / FIDE