I thought you were talking about the Candidate's tournament. As for the championship match, it's not generally believed that Spassky severely underperformed anyway. He won several games and put up good fights in the draws and losses.

>I believe you didn't read much about his championship match

I am quite familiar with the surrounding circumstances, including the pre-match negotiations. I do not see how any of this "mentally unbalanced" or "broke" Spassky, unlike (arguably) Larsen and Taimonov. Furthermore, he's generally been commended for his behavior as a consummate professional and a "gentleman" in the circumstances.

I wonder if you are as familiar with chess (the game, professional play, and its history) as you lead on to be, posting all over this thread.