Giving up all its initial gains, the Sensex at the Bombay Stock Exchange stood 195 points, or 1.1 percent in the negative zone, at 18,441, in afternoon trade, a short while ago, after the Reserve Bank of India kept key policy interest rates unchanged. Earlier in the morning, however, the Sensex had opened with a small gain of 14 points, at 18,649, on hopes of a rate cut by the RBI.Key stock markets in China, Indonesia, Singapore, Taiwan and South Korea had advanced between 0.1 percent and 1.1 percent, today.