If that is 50 years ago... How old are you?!?
Also, I love seeing how chess evolves over time. 6. Bg5 was old mainline, but things slowly are improved and touched up on, until it gives way to a new thing.
Also also, great game, and amazing annotations and commentary! Such a shame that game showcases and analyses are always getting barely any attention.
... against a player who later became a FIDE Master, peaking at 2349 FIDE in the early 2000s.