A multi-select fieldtype stores its values as follows.
VALUE_1|*|VALUE_2|*|VALUE_3
So using an equal to operator can't work for such a value. You need to use the regexp operators to do an inline match. Example as follows.
<p>[cb:if cb_genres=~"/alternative/" and cb_type="soft"] go tho this link [/cb:if]</p>
Now if you want it to match multiple values in that select value you'd use the below for example.
<p>[cb:if cb_genres=~"/alternative|country/" and cb_type="soft"] go tho this link [/cb:if]</p>
See the below tutorial for further substitution usage information.
www.joomlapolis.com/documentation/279-community-builder/tutorials/18353-using-substitutions-throughout-cb