Over a span of six days in March, Boyd Gaming closed its 29-property portfolio in 10 states and subsequently changed the financial direction of the Las Vegas-based regional casino operator for at least the rest of 2020, and possibly into next year. At the time, Boyd was heading toward healthy first-quarter results after two months. “Then came March, and the COVID-19 outbreak transformed our business and the communities we operate in,” Boyd Gaming CEO Keith Smith said Tuesday on the company’s quarterly conference call, recalling the days in which efforts to slow the spread of the coronavirus pandemic led to a nationwide shutdown of the casino industry.