Multi PV best move rankings - Next Chess Move

What to the scores mean after calculating 4 multi PV. If I’m playing black do the lower scores indicate the best move or does the highest score indicate the best move?

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Understanding Chess Move by Move by Nunn, John

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Next Chess Move on the App Store

Understanding Chess Move by Move (Instructive Chess) - Kindle edition by Nunn, John. Download it once and read it on your Kindle device, PC, phones or

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How to Find the Best Chess Move (Complete Guide) - PPQTY

How accurate / useful do you find this new game rating function