These are normal IN mechanics - it matches anything in set, not all of set combined.

Type of match you want is called tag_slug__and in WP query arguments. You can see code that generates SQL for it in source of WP_Query-&gt;&amp;get_posts() method.

Resulting SQL is like this:

SELECT p.ID 
FROM wp_posts p 
INNER JOIN wp_term_relationships tr ON (p.ID = tr.object_id) 
INNER JOIN wp_term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id) 
INNER JOIN wp_terms t ON (tt.term_id = t.term_id) 
WHERE tt.taxonomy = 'post_tag' 
AND t.slug IN ('is', 'filler') 
GROUP BY p.ID HAVING count(p.ID) = 2


Tags to Post-ID mysql query. Tag Search
In my experience, cloister tiles in Carcassonne are often "too lucky". If you draw a cloister tile in the beginning of the game, it will typically still require an investment of quite a bit of "meeple" time to obtain the full 9 points, which makes it a fair trade-off. However, after about half of the game, it's relatively likely that you can "parachute" a cloister tile in some spot and get 8 or 9 points immediately. This adds a lot of randomness to the game.

What house rules work well to diminish this effect?
