The Santiago suburb of Las Condes has been a right-wing hub for ages. It is where Joaquin Lavin made his career.
This time round, however, the Alianza was worried of losing its 'doblaje', which under the binominal system would give it two seats in the House of Deputies. The source of this concern was the candidacy of Rodrigo Garcia Pinochet -- yes, that Pinochet. His grandson, in fact, who ran as an independent.
In the end, RGP got about 10% of the vote, but even then could not put a dent in the Alianza's fortress. It held on to its doblaje, electing Ernest Silva and Cristian Monckeberg.
Even a former police general, running for the Concertacion, couldn't inspire the wealthy citizens of Las Condes to move away from the Alianza.