MELT unsweetened chocolate and butter over low heat, remove; add crumbs and pecans; mix well.
PRESS into 9 inch (23 cm) square pan. Chill.
MIX pudding powder, butter and water; blend in icing sugar until smooth. Spread over base; chill until firm.
MELT chocolate and cream over low heat; stir until smooth. Spread over pudding layer. Chill.
STORE in refrigerator; let stand at room temperature 5 minutes before slicing.