Preheat oven to 350°F. Grease and flour 9-inch round cake pan. Line bottom of pan with wax paper; set aside.

Microwave 4 of the chocolate squares and butter in large microwaveable bowl on HIGH 1-1/2 to 2 min. or until chocolate is almost melted, stirring after 1 min. Stir until chocolate is completely melted. Add sugar; mix well. Blend in eggs and vanilla. Add flour and salt; mix well. Stir in pecans. Pour into prepared pan.

Bake 40 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool in pan 5 min. Run small knife around side of pan to loosen edge. Invert torte onto serving platter; remove wax paper. Melt remaining 2 chocolate squares. Drizzle over top of torte. Let stand until firm.