New Delhi, June 24 -- China has reclaimed the top position on the world's most authoritative supercomputer rankings, with a domestically built machine powered entirely by homegrown chips surpassing its American rival for the first time since 2017. The achievement signals a significant shift in the global technology rivalry between Beijing and Washington, and raises fresh questions about the effectiveness of US export restrictions on advanced semiconductors.

The machine at the centre of this milestone is called LineShine, housed at the National Supercomputing Centre in Shenzhen, China's southern technology hub. It has displaced El Capitan, located at the Lawrence Livermore National Laboratory in California, from the summit of the TOP500 l...