What rules to follow when the tag automatically selects anchors?

Based on my demand, I need put six anchor in one room to improve my tag precision, Just like figure below. I use DWM1001 to build my network. When tag A is located on the left of the room, there are five anchors on the right and one anchor on the left. Tag A can’t receive information from anchor 6 for some reason now. So the coordinate calculation of tag A is only based on the other anchors.

Now I can’t figure out the tag A coordinate calculation is based on all other five anchors or only four anchors. If the calculation is based on only four anchors, which anchors will be choose by tag A? If the tag A moves to location B, which anchors will be choose again? What rules to follow when the tag automatically selects anchors?

Thank you.

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please see:

https://www.decawave.com/decaforum/showthread.php?tid=909

https://www.decawave.com/decaforum/showthread.php?tid=911

https://www.decawave.com/decaforum/showthread.php?tid=916

Thanks for your reply.
tcguoxing
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I have another question. When all the anchors is located at the first quadrant of the tag. what anchors will be choose by the tag?

Thank you and Regards
tcguoxing