Barra Da Tijuca, Rio de JaneiroBrazil -- Semifinalists have been decided for the Billabong Women's Rio Pro, Stop No. 5 of 7 on the 2012 ASP World Championship Tour, as the world's best female surfers made the most of the tricky one-to-two foot (0.5 metre) waves on offer at the primary site of Barra da Tijuca.