Shares of Tencent (TCEHY -9.69%) were down 10.3% as of 12 p.m. ET Friday after Chinese authorities proposed new rules aimed at curbing excessive online gameplay and spending.China's new round of online gaming rulesIn a draft document released this morning, regulators from China's National Press and Publication Administration say they're seeking public comment on several new proposed restrictions for online gaming companies in the country. Among those restrictions are a ban on daily login rewards, lower rech ...