Snapping a two-session losing streak, the benchmark BSE Sensex today recovered by 81 points in early trade on fresh buying by funds and retail investors. The 30-share index, which had lost over 126 points in the previous two sessions, gained 81 points to 20,849, with realty, metal and oil and gas sector stocks leading the recovery. Similarly, the National Stock Exchange index Nifty rose 34 points to 6,212.