There are two games left as it turns out. Inescapable conclusion is that the final points 12.5-8.5 could hypothetically be reversed with these individual moves and indicated result:
GAME 6: Change to new move 15 ...Rxc5 and Black would win not White, 0-1 not 1-0, for interim 11.5-9.5. ...
GAME 13: New move 25 f5... and White should at least Draw, 1/2-1/2 not 0-1, for interim 11.0-10.0.
GAME 15: New move 28 R x e5... and White definitely wins, 1-0 not 1/2-1/2, for interim 10.5-10.5.
GAME 5: New move 27 Qb1... and White should Draw, 1/2-1/2 not 0-1 (only this Game 5 annotation to be completed yet), for interim/final result 11.0-10.0, now Spassky total on the left side for the first time.
Each of the above four changes is progressive accrual in favor of Spassky and against Fischer. Thus with just those four revised moves in different games, Spassky could have been winner 11.0 to 10.0 in re-tallying of the points total by way of thought-experiment.
There are two games left as it turns out. Inescapable conclusion is that the final points 12.5-8.5 could hypothetically be reversed with these individual moves and indicated result:
GAME 6: Change to new move 15 ...Rxc5 and Black would win not White, 0-1 not 1-0, for interim 11.5-9.5. ...
GAME 13: New move 25 f5... and White should at least Draw, 1/2-1/2 not 0-1, for interim 11.0-10.0.
GAME 15: New move 28 R x e5... and White definitely wins, 1-0 not 1/2-1/2, for interim 10.5-10.5.
GAME 5: New move 27 Qb1... and White should Draw, 1/2-1/2 not 0-1 (only this Game 5 annotation to be completed yet), for interim/final result 11.0-10.0, now Spassky total on the left side for the first time.
Each of the above four changes is progressive accrual in favor of Spassky and against Fischer. Thus with just those four revised moves in different games, Spassky could have been winner 11.0 to 10.0 in re-tallying of the points total by way of thought-experiment.