Bitcoin slides as much as 20 percent as Chinese yuan rises

By Jemima Kelly LONDON (Reuters) - A dramatic rally in digital currency bitcoin came to a spectacular end on Thursday with a plunge of up to 20 percent as China's yuan rose sharply - further evidence of an intriguing inverse relationship between the pair. Exchanges in China say they account for more than 90 percent of global bitcoin trading, which would help explain why a shift in Chinese demand would sharply affect the price.