> "Grandmasters sustain elevated blood pressure for hours in the range found in competitive marathon runners," Sapolsky says. > It all combines to produce an a

> "Grandmasters sustain elevated blood pressure for hours in the range found in competitive marathon runners," Sapolsky says. > It all combines to produce an average weight loss of 2 pounds a day, or about 10-12 pounds over the course of a 10-day tournament in which each grandmaster might play five or six times.