Bengaluru, May 7 -- Former world champion Vladimir Kramnik who has been playing self-appointed vigilante against cheating in online chess has raised questions over the performance of one of India's young chess stars, Nihal Sarin. Kramnik, who earlier implied that world No.3 Hikaru Nakamura's streak of wins was suspicious, has suggested that Indian GM Nihal Sarin's online blitz results against the world's top 10 players this year are "mathematically 99.9999% impossible."...