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Mon 04 Apr 2007O'Sullivan's tactical game leaves him sitting prettySNOOKER/World Championship:Ronnie O'Sullivan resumes today with a 6-2 lead over Neil Robertson in the best-of-25-frame contest offering a quarter-final place in the world championship, having made two centuries but relying for his other four successes largely on the high-quality tactical game which he does not always have the patience to employ.Robertson, who beat O'Sullivan in winning October's Grand Prix in Aberdeen and February's Welsh Open, albeit in two best-of-nine sprints, was also shaken by missing an easy frame-ball blue in the third, which would have given him a 2-1 lead after his 87 had finished the opening frame and O'Sullivan's 104 had accounted for the second.