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By Gabriel Wildau SHANGHAI (Reuters) – The price gap between bitcoins trading in Chinese yuan and those sold for other currencies has evaporated in recent days, highlighting the porous nature of Chinas capital controls. Chinese bitcoin chat rooms buzzed last month as investors noticed that the digital currency as sold on Chinas biggest exchange was more expensive, in dollar terms, than bitcoins traded abroad using dollars, creating a tempting arbitrage play. Traders could earn profits by buying bitcoins using dollars on a foreign exchange such as Mt. Gox, reselling them for yuan at the higher price on BTC China, the main local exchange, and finally converting the yuan back to dollars. A key driver of the price gap was Chinas capital controls, which make it difficult for speculators to swap yuan proceeds from the sale of high-priced Chinese bitcoins into dollars.