George Duke wrote on Sat, Sep 1, 2012 11:26 AM EDT:
The result of the match 12.5-8.5 Fischer over Spassky changes to Spassky
over Fischer 11.0-10.0 with these four moves improved:
http://www.chessvariants.org/index/displaycomment.php?commentid=29434.
However, there was a fifth move alteration to factor in, Game 11, http://www.chessgames.com/perl/chessgame?gid=1044724, where 22 ...Bb5 wins for Black in this case Fischer. That causes revision total points to 10.5-10.5. Since Spassky as the champion appropriately would have the tiebreak of this kind, as done today, Spassky wins again 10.5 to 10.5. Petrosian in 1966 defended the title against Spassky 12.5-11.5, and then in 1969 Spassky had become world chess champion with 12.5-10.5 over Petrosian. So Fischer-Spassky 1972 was Boris Spassky's third championship match, and he reigned 3 years the same duration as Bobby Fischer more or less.