Russian grandmaster Daniil Dubov — who bragged about using his cell phone for just 10 minutes to prepare for classical games against Praggnanandhaa and then defeated the Indian prodigy in tiebreaks — has crashed out of the FIDE World Cup after losing the tiebreaks to American GM Sam Shankland. Dubov is a former World Rapid Champion, but was knocked out by Shankland in the rapid tiebreak on Sunday after losing both his games in the 15-minute time control (with 10-second increments per move). Dubov has used the strategy of playing out draws, especially with white pieces, in classical games before defeating his opponents in the tiebreaks. How Daniil Dubov lost to Sam Shankland Game 1 of rapid tiebreak Game 2 of rapid tiebreak Story continues below this ad After his win over Praggnanandhaa, Dubov had revealed that he had spent just 10 minutes preparing for the classical games against the Indian. “Generally Praggnanandhaa didn’t show his best in this tournament, not only in this match. I would say it was very close but I think …