It was move 19 that I blundered.
Wrong Piece Identification
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Oct 21, 2022
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#3
It is probably because if each of you played the engine’s top line, you would have lost a knight:
Oct 21, 2022
0
#4
When I click the Show Moves button on that piece of Coach feedback ("19.Qb2 is a blunder"), I see a line where you lose the knight on f3 (but you keep your bishop on h7). This is what @f3_Kf2_1-0 was pointing out as well.
So I think the coach feedback is correct here. (After the queen trade, black doesn't want to take white's hanging bishop because white would respond with Rxh6+, followed by doubling the rooks on the h-file.)
I was looking at a game review and had I moved my Queen which was guarding a BISHOP that was under attack. My "coach" said that the move was a blunder and I was losing a KNIGHT this way. I was actually losing a bishop. I have attached a link to the game below.
https://www.chess.com/analysis/game/live/59861371047?tab=review