Analysis of a recent game, help going from opening to middle game


Afer 5.. Na5, what was wrong with Bb3?
After 9.. b5, your bishop was not done. What's wrong with retreating it to b3?
After 12 Nxe5, your opponent blundered back. What would you have done after Nxe5 ?
18 Rxc8+ is a forced mate. (Threat is Qxd7+, king moves, Qe7++)
19 Rxc8+ still wins.
There were so many blunders in this game, including giving up the game ender a mate in one, that a basic focus on tactics problems would be helpful. You are a premium member. You can do unlimited problems.
And if you are so afraid of losing a bishop for a knight, you need to go back to the basics and read some basic books about chess and the relative value of the pieces. About six months after that start worrying about middlegame transitions.

I know what the relative value of the pieces are, and normally I'm not that worried about losing a bishop for a knight. I know point value is even at 3 a piece. I also know that when I trade pieces early, I'm usually down material when the middle game started.
After 9, I see that it would have been better bringing it back to b3 and trading then.
As far as the forced mate goes, I'm still working on my calculation skills, but I can't believe I missed that. Thanks.
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