Sometimes I don't get the analysis

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ballabosh

"A better move was bxc3."

First of all there is no piece on b3 to be taken. Secondly, there is no b that can take this phantom piece.

 

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manekapa
The previous move for white was the pawn move c2-c4. Black could have captured that pawn “en passant” with the pawn move bxc3 instead of Qc5.
manekapa

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ballabosh

Ah. Thanks.