Snapping five days of losses, the Sensex at the Bombay Stock Exchange ended with a solid gain of 434 points, or 2.3 percent, at 19,697, today, as investors bought stocks at lower levels, amid rising Asian and European markets, and easing crude oil prices. The benchmark index had lost 440 points in the last five trading sessions. The Nifty at the National Stock Exchange jumped 126 points, or 2.2 percent, to 5,912.Stock markets in Japan, China, Hong Kong, South Korea and Singapore gained between 0.7 percent and 1.6 percent.