bd3 blunder vs bf7

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LSUMD

https://www.chess.com/analysis/game/live/4822887924

Beginner question... what is explanation for bd3 blunder? why is bf7 so much better? Am I missing a mate in 3 or something? 

french

hope this helps

LSUMD
Thanks! I’m so focused on material and piece value... hard to see that far past sacrificing bishop.
eric0022

In that line 9. Qd5# is mate.

Clavius

A few more lines.

 

french

you are welcome!