Unclear engine recommendation

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heaviesideSF2

Why the engine says move 7-> White Bishop to b2 is a weak move?
Instead it is recommending to take the knight with the pawn on a3. To me it seems that I will just loose the rook that way.

Martin_Stahl
heaviesideSF2 wrote:

Why the engine says move 7-> White Bishop to b2 is a weak move?
Instead it is recommending to take the knight with the pawn on a3. To me it seems that I will just loose the rook that way.

 
 

The main idea is that after Nd5 you're going to get the rook back