Seoul stocks surged by double digits shortly after Friday's opening, triggering buy-side trading curbs on both the Kospi and Kosdaq indexes within minutes. As of 9:20 a.m., the Kospi was trading nearly 13 percent higher at 6,313 points, remaining in double-digit territory after climbing as much as 14 percent to an intraday high of 6,386.05. The benchmark opened 1.15 percent higher at 5,657.79, before rapidly advancing past 6,300. A buy-side sidecar was activated at 9:06 a.m., suspending program