He beat some world champions : Vasily Smyslov at the Moscow Spartakiad 1974 , Tal at Sochi 1970 , and a young Garry Kasparov at the 1978 Soviet Championship .
He was co-winner of the 1978 Soviet Championship ( with Mikhail Tal ) and winner of the 1986 Championship .
co-winner beat some world champions : Vasily Smyslov at the Moscow Spartakiad 1974 , Mikhail Tal at Sochi 1970 , and a young Garry Kasparov at the 1978 Soviet Championship .
He was co-winner of the 1978 Soviet Championship ( with Mikhail Tal ) and winner of the 1986 Championship .