It looks like 20 e5 was the mistake that dropped the pawn. The pawn was only protected twice on e5 and was attacked 3 times. The f4 pawn could have help but it was pinned against your queen.
Where did I go wrong in this game??
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I am white and I know i did a very bad blunder at the end but I didnt understand much of the analysis. How did I end up a pawn down even after playing the opening perpfectly?