The Sensex at the Bombay Stock Exchange gained over 200 points, to cross the psychological 21,000-mark after a gap of 35 months, in morning trade, today, on good buying by investors, on the back of strong foreign capital inflows. But the Sensex later lost ground, to stand 19 points, or 0.1 percent in negative territory, at 20,749 in afternoon trade, a short while ago. Other Asian markets in Japan, China, Taiwan, South Korea, Hong Kong and Singapore had lost between 0.1 percentand 0.8 percent, today, after US shares retreated from a record high, amid disappointing company earnings forecasts. The US Dow Jones Industrial Average had slipped 0.4 percent, overnight