A Canadian government source close to the talks said the American and British delegations are now effectively steering the talks and have "streamlined'' the negotiations.
They included only a handful of advisers from Canada and the African Union, leaving representatives from various European and African nations on the outside.
"The U.K. and U.S. decided working with the large community of nations was too cumbersome at this stage and the African Union approach had been exhausted,'' said the source, who spoke on condition of anonymity. "If this (new) strategy succeeds, it could break the logjam.''
The current U.S.-British strategy is to split up the rebel concerns between them, and come up with amendments to the peace deal the rebels might accept. They've seen progress on the issue of security, but are still stuck on power-sharing within the Sudanese government.
And so, negotiators have started the grim task of planning for defeat, the senior source said.
That Plan B would include a ceasefire, safe access to the country for humanitarian workers, and protection for camps of displaced persons.
"If they don't agree, the results will be nothing short of catastrophic,'' said the Canadian source.
BBC World Service broadcasts to Juba in Southern Sudan and surrounding areas in Arabic on 90.0 FM and in English on 88.2 FM. In Northern Sudan: Khartoum 91.0 FM, Al Ubayyid 91.0 FM, Port Sudan 91.0 FM and Wad Madani 91.5 FM.
“Violence will bring no victory. For the sake of the Darfur civilians, all parties to the conflict have to stop resorting to violence. This is the absolute priority.” - Luis Moreno-Ocampo, Prosecutor of the International Criminal Court, 05 June 2009
"APPREHENSION" by Rob Rooker. Painted on a wall in Maridi, Sudan. The image is of a young Nuer boy looking up among a crowd of people. Click on image for more details. Cards & prints of Rob's paintings can be purchased online at Imagekind.com