Essex v Yorkshire CCC: Latest updates from County Championship match at Chelmsford
At tea on day four, Cook has 80 out of 119-0 as he bids to hit two hundreds in a game for the first time in his career.
The former England captain scored 107 in the first innings.
Cook and Nick Browne (29) experienced no alarms in the afternoon session as Essex advanced from 7-0 at lunch.
The hosts lead by 57 runs but it is all academic now as the game approaches its conclusion.
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