How to Make 19,267% in China and Lose It All in 24 Hours

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Even by the boom-bust standards of China, the moves are incredible: gains as large as 19,267 percent in one trading session, a near-complete wipeout in the next.

Welcome to the country’s options market, where outsized swings are par for the course and trading has never been more feverish. As volatility in Chinese stocks soars, some brave speculators are using options to magnify their bets.