sneaky pete: What do the experts say about this game?
Anatoli Mazukewitsch, Angreifen mit Evans-Gambit, 1991: in the correspondence game Nilsson vs Böhm (1972) the imprudent 17... Rb8? resulted in a quick catastrophe 18.Rd8! Bg4 19.Qxb8 1-0
Tim Harding, Evans Gambit And A System Vs. Two Knights' Defense, edition 1991: in Nilsson vs Bohm, postal 1979, he [Black] blundered 17... Rb8? 18.Rd8! Bg4 19.Qxb8! 1-0
Harding and Cafferty, Play The Evans Gambit, edition 1997: Nilsson vs Bohm, correspondence 1979, went 17... Rb8? 18.Rd8! Bg4 19.Qxb8! 1-0
József Pálkövi, Italienische Partie und Evans Gambit, 1998: 17... Rb8?? makes a poignant conclusion possible 18.Rd8 Bg4 19.Qxb8! 1-0 Nielsen vs Bohm, correspondence 1979
So Nilsson vs Böhm, 1972, developed in Nielsen vs Bohm, 1979, but on the value of the moves one agrees. None of these eminent theorists considers that it might have been sensible for Black to give his King air after 18.Rd8 .. by moving the g-pawn. For instance, after 18... g5
it's hard to see why 17... Rb8 was a blunder.
What to think of such experts? I'll leave that to the reader, I'm too polite to have an opinion.