zydeco: Ivkov's self-lacerating notes to this game are amusing.
6.Nc3: "A man will sometimes ask himself after a game why he did not play the normal, 'classical' moves. Really, why is not the better move 6.c4, which I had been playing in innumerable games up to the present? I wanted to get away from the prepared variations of my young opponent - that would be the only explanation for the inferior move 6.Nc3. I would say with astonishment that to a reasonable extent I succeeded - the position which I obtained from the opening was actually better."
Ivkov is following a Spassky-Bronstein game through to move 14 when he deviated with the inferior 14.N4d3.
14.N4d3: "I thought that Bobby would not give up one of his bishops, due to his known love for these pieces. But Bobby always plays the strongest moves regardless of favorites."
20.Bf3: "....The move in this position is 20.a4 to delay black's advance on the queenside. It is not clear to me why I did not play it. Moreover, it is not clear how I could find so many weak moves in one game. It seems that such things happen."
22.Qe2: "A move without sense."
24.Be5: "Less harmful would be 24.Be5."
36.Rf3: "The last error - thank God!"
42.White resigns: "Fischer, with his fine technique, took advantage of the poor play of his opponent."