SOME 700 members of Angola’s Unita movement opened a congress here on Monday to elect a new chairman in place of Jonas Savimbi, whose hardline militarism split the group in September. Angola late last year plunged back into civil war between Unita rebels, who long fought the formerly Marxist regime after independence in 1975, and government troops, in spite of peace accords signed in 1994. Unita now effectively comprises two opposed factions, one supporting Savimbi’s rejection of the peace accords, the other aligned with the Luanda government. Luanda has recognised the dissidents as the government’s “only partner” in the peace process and broken off dialogue with Savimbi himself.