See the following link for a very famous game.
http://www.chessgames.com/perl/chessgame?gid=1233404
Philidor Defense
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Sep 16, 2016
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#2
Good game thanks
i always just try to recreate the morphy game that horsesgalore posted, you don't need anything more than that
@HorsesGalore Fantastic game! Thanks for sharing it!
And here is an chess.com article about the "Opera Game"
https://www.chess.com/article/view/a-night-at-the-opera
Hey friends , I would like to know the best variation for white from this position