Sort related nodes in block views based on a score calculated with common vocabulary Is it possible in drupal8 with Views to show related nodes in a block based on a score calculated with common vocabulary (each common tag adds some  affinity points depending on vocabulary type).

The sorting in views is ordered by:
1- Editor manual selection. 
2- Best related nodes ordered by max affinity with the current node
3- Nodes sorted by date

Regards,
Thanks for your help
To place the php code to calculate the score there are several approaches:


Add an extra field for the score to your content type and calculate it in submit or
presave.
Add a custom views field plugin:
http://enzolutions.com/articles/2015/10/11/how-to-include-php-code-in-drupal-8-views/ or a custom sort plugin: https://chromatichq.com/blog/create-custom-views-sort-plugin-drupal-8
Use the module Computed Field.


With (1) you save the value in the database. This is best for calculations that don't change after saving the content.

A custom views plugin (2) is more dynamic and needs no space in the database, but it has to be recalculated each time.

The extra module (3) can do both, but it is not ready for production, still in alpha. If you read the linked how-to for views field plugins in (2) there are some good points that in D8 plugins are often more powerful than contrib modules to extend Drupal with custom php code.