World champion D Gukesh lost his second game at the Norway Chess tournament here as compatriot Arjun Erigaisi broke through his defences in the second round to emerge as the joint leader with 4.5 points along with America’s Hikaru Nakamura.

World No. 2 Nakamura, meanwhile, stunned top-ranked Magnus Carlsen via an armageddon tie-breaker.

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