Karpov had a marked preference for positional play, although, in his own
words, "if my opponent offers sharp play, I do not object." Karpov had
no soft spots that anyone could discern -- an alleged weakness against
'romantic' openings was less of a handicap than the openings some chose
Karpov has always embraced the need for deep preparation. Here he digs
deep into a position that was all the rage at the time.
Boris Spassky became World Champion on the second attempt, defeating Petrosian in 1969 and losing his title to Fischer in 1972. He had something of a reputation of having a 'universal' style, able to play all positions well, but that is true of anyone who holds the crown of chess, and he has a marked facility with dynamic and attacking play.