As there is a tie in parliament if the centrists don't form a co-alition with the Liberals,is that the most likely progression?
If there is a tie, how is it resolved?
I really don't know, but it all comes down to wheather Andorra has negative or possitive parliamentarism, meaning wheather the government has to have a majority against it (it hasn't because of the tie and the political diffences between the other parties) or it needs a majority to continue (like in Germany). My guess! is that there has to be a majority against the government to force it to resign, so it will probably continue and negociate from case to case with the other parties. Remember it isn't a bad situation for a minority government. It only needs the votes of one of the other 3 parties in parliament to ensure a majority.