Fischer vs Petrosian - The One Hit Blunder!

Fischer had a slight advantage throughout the game but nothing that would have caused Petrosian to lose drawing chances. Then on move 33 Petrosian got greedy and thought he won a pawn and possibly a second, only to realize that he just gave away the game. At first glance it seems there is no reason to resign. But upon closer review, Fischer's 34th move was a killer. Petrosian actually had a good move for his 33th move. Play through the game and on that move I'll tell you what he should have done. I may not be correct though. You decide. The full game with my recommendation on move 33 for Petrosian is below.