Rising for the third straight session, the Sensex at the Bombay Stock Exchange gained a marginal 14 points, or 0.1 percent, to close at a nearly two-week high of 19,916, after volatile trade, today. The Sensex had gained 522 points in the previous two trading sessions. But the Nifty at the National Stock Exchange declined 2 points, to 5,907. Stock markets in Japan, Hong Kong, South Korea and Singapore fell between 0.1 percent and 0.9 percent.