sentences:  He began playing darts in 1999, but it wasn't until 2005 de Ruiter became popular in the BDO circuit when he reached the semi-finals of the Welsh Open and the Welsh Classic.De Ruiter made his World Championship debut in the 2006 Lakeside World Championship, but lost in the first round to Shaun Greatbatch.De Ruiter was runner-up to Welshman Mark Webster in the 2006 WDF Europe Cup.