Very instructive comparitions and a lot of work to find exact positions. Nice!
Just two suggestions.
It's strange a little to refer to engine's evaluation of Philidor defense after second move that this is +1 for white. I agree that h3 is not the best move in this position but talking about +1 after move two in defence that is played from hundreds years is kind of exaggeration.
About this "big blunders game" - bad example 6 - you wrote: "h3 is played, and it remains unclear why this was played." I guess it was played to avoid black's Qg4 with Q trade. So hard to say it was bad idea on this level with two pieces less. But OK, now I see f3 was much better. :D
Just two suggestions.
It's strange a little to refer to engine's evaluation of Philidor defense after second move that this is +1 for white. I agree that h3 is not the best move in this position but talking about +1 after move two in defence that is played from hundreds years is kind of exaggeration.
About this "big blunders game" - bad example 6 - you wrote: "h3 is played, and it remains unclear why this was played." I guess it was played to avoid black's Qg4 with Q trade. So hard to say it was bad idea on this level with two pieces less. But OK, now I see f3 was much better. :D