I have the following scenario.
There is a multiselect attribute named "a" with options "a1", "a2", "a3" etc
Also there are two products:
product "pr1" which is connected with attribute "a" and uses options "a1", "a2" and
product "pr2" which uses only option "a1".
Currently, when "a1" option is selected in layered navigation, results will contain both products "pr1"and "pr2".
I would like to ask if it is possible to return only products which fullfil the exact selected option.
In the specific scenario, if "a1" option is selected, results ll contain only product "pr2".
Edit: magento version 1.9.2.2
If if is not possible, does anyone know if there is any extension with this ability?