You probably wouldn’t have guessed the first European technology startup to pass the $10 billion valuation mark would be the maker of “Boom Beach,” whose name makes Deal of the Week host Alex Sherman laugh. China’s largest internet company, Tencent, is leading a group that will buy 84 percent of Supercell for $8.6 billion. Most of that is being sold by SoftBank, the majority holder of the Finnish gaming company. Bloomberg managing editor Peter Elstrom happens to be visiting from Japan, just in time to give us his expert analysis on why SoftBank is selling now and why the company’s CEO heir apparent -- Nikesh Arora -- surprisingly quit.\u0010\u0010(Corrects title in second sentence)