the last chapter called "Evans Gambit Destroys!" in the game, i got a 40 average centipawn loss, but i made 1 inaccuracy and had no mistakes, can someone tell me why?
The Evans gambit is not really popular these days. It was very popular during the 19th Century, where it was basically as popular as the Sicilian is today.
To actually answer the OP's question, it's because you played one move that drops the computer's evaluation from +15 to +8. Normally a 7-pawn blunder is catastrophic, but not when you're so winning your opponent might as well resign.
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