Because bxe6 is good for white, and because that b pawn will be hard to defend considering the c pawn is blocked in by the knight. You should have posted this in the analysis forums, you would have gotten better answers.
Why is a4 in this position an inaccuracy
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hey played this game can you guys tell me what you think and what I need to improve on and also why a4 apparently is an inaccuracy at move 9 for white