The Bombay Stock Exchange benchmark Sensex gained over 87 points in opening trade today, extending its winning streak for the sixth straight session on continued capital inflows by foreign funds.The 30-share index rose by 87 points to 19,296 points. The index gained almost 990 points in the previous five sessions. The wide-based National Stock Exchange index Nifty moved up by 22 points to 5,782 points.