Trimming its initial gains, the Sensex at the Bombay Stock Exchange was trading 35 points in the positive zone at 20,694 in afternoon trade, a short while ago.The 30-share index, which had lost over 665 points in the last five sessions, today opened 94 points in the green to 20,753. The Nifty at the National Stock Exchange was up 12 points at 6,167.