Position understanding

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TijsQuartier

Hi, can someone tell me why Qc1 is best here? As you can tell I played axb5 which I felt like being pretty obvious and it puts pressure on the knight. Is it because the knight was hanging?
I felt like we can foresee the Bishop on c8 ready to defend, no? -Thanks!

limber_up

I think it's because it protects against Blacks threat of Qb4+ while simultaneously creating a threat of your own, and you basically get to improve the position of your queen for free.