MOSCOW, September 6 Russian grandmaster Ian Nepomniachtchi tied with American Wesley So in the fourth round of the fifth stage of the Grand Chess Tour in St. Louis (USA) — the Sinquefield Cup. The game in which the Russian played with white pieces ended after the 25th move. The current world champion Norwegian Magnus Carlsen lost with white pieces to the representative of Azerbaijan Shakhriyar Mamedyarov, after which announced that he had withdrawn from the tournament.
