Is it possible to travel from Kratie direct to Siem Riep?
As far I remember the bus to Rattinikiri stops at Kratie (so I was told by someone who was on my bus heading there). They had to change bus though in Kampong Chham and waited there for 30 or 40 min. If hou ask one of the travel agents in SR and they might be able to tell you if there is a direct connection
Right now, there express minibus that go straight to Siem Reap. It takes around 7 hours and daily departure at 7:00 am. Tel: 0888364857.