Harsha Bharathakoti stunned second seeded Russian Pavel Ponkratov to join National champion Arjun Erigaisi and runner-up D. Gukesh in the lead after an action packed eighth round of the Delhi International Open chess tournament on Sunday. Harsha needed 58 moves to stop Ponkratov and reach seven points after Arjun halted in-form Lalith in 28 moves. On a day when the …